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| TITLE | ISSN | COMMENTS | FORMER TITLE | FORMER ISSN |
| O A G Official Traveler. Travel Guide | 1073-0338 | Incorporates (1992-1998) | O A G Official Traveler. Flight Guide | |
| O A S D I Beneficiaries by State and County | 1073-1482 | Formerly (until 1986) | Social Security Benefits by State and County | 0888-8302 |
| O E C D Economic Surveys: The Czech Republic | Incorporates in part | O E C D Economic Surveys: The Czech and Slovak Republics | ||
| O E C D Economic Surveys: The Slovak Republic | Incorporates in part | O E C D Economic Surveys: The Czech and Slovak Republics | ||
| O E C D Oil, Gas, Coal & Electricity Quarterly Statistics | 1025-9988 | Former titles | O E C D Quarterly Oil Statistics and Energy Balances | 1013-9362 |
| O E R I Bulletin | 1054-9919 | Former titles (until 1991) | Office of Educational Research and Improvement Bulletin | 1052-3642 |
| O H A Law Journal | Formerly (until 1989) | O H A Law Reporter | 0898-7637 | |
| O L G Rechtsprechung | 0943-0997 | Formerly (until 1992) | O L G Rechtsprechung Aktuell | 0941-9845 |
| O L M S Occasional Paper | Formerly | O M S Occasional Paper | ||
| O N A News | 0834-9088 | Formerly (until 1987) | Ontario Nurses Association. Newsletter | 0704-8009 |
| O N S Omnibus Survey | Formerly | O P C S Omnibus Survey | ||
| O P A C Directory | 1066-1425 | Formerly | Dial In | 1047-3424 |
| O R - M S Tomorrow | Formerly | O R S A Student Communications | ||
| O S - 2 Magazine | 1073-1547 | Incorporates (1988-1996) | I B M OS-2 Developer | |
| O S H A and Safety Meetings Handbook | Formerly | Safety Meetings Handbook | ||
| O T C - Over the Counter | Formerly | Over the Counter | 0957-7831 | |
| O V K Nuus | Former titles (until Dec 1998) | O V K Boerenuus | ||
| Oase | 0169-6238 | Supersedes (1981-1985) | O - Ontwerp, Onderzoek, Onderwijs | 0167-8620 |
| Oasis | 0188-6207 | Formerly | Lavidaloca | |
| Oberoende | 1102-9021 | Former titles (until 1992) | Slaa Tillbaka | 0349-2958 |
| Object Lesson | 1067-1331 | Formerly (until 1993) | West (Amherst) | 1061-429X |
| Obra Publica | 0213-4195 | Formerly (until 1989) | Collegi d'Enginyers de Camins, Canals i Ports, Catalunya. Full Informatiu | 0213-4209 |
| Observatorio Sismologico y Vulcanologico de Arenal y Miravalles. Boletin | Formerly | Observatorio Vulcanologico del Arenal. Boletin | 1015-4396 | |
| Obshchaya Programa po Informatsii - Byulleten' J U N I S I S T | 0379-2234 | Formerly (until 197?) | Informacionnys Bulleten. U N I S I S T | 0304-0062 |
| Obzor Tekstil'noi Promyshlennosti | 0956-3792 | Formerly | Textile Review U S S R | |
| Occasional Papers in Open and Distance Learning | 1038-8958 | Formerly (1990-1992) | Occasional Papers in Distance Education | 1034-7186 |
| Occasions d'Affaires | 1486-0716 | Formerly (until 1998) | Revue Occasions d'Affaires | 1192-4551 |
| Occupational Ergonomics | 1359-9364 | Announced as | Occupational Ergonomics and Safety | |
| Occupational Health & Safety Week | 1524-0622 | Formerly | OSHAWeek | 1057-1485 |
| Occupational Health Magazine | 1032-0989 | Former titles | Occupational Health and Safety Products and Services | 1032-0970 |
| Occupational Health News | 1441-144X | Formerly (until 1998) | Occupational Health Newsletter | 1320-1514 |
| Oceana's Legal Almanac Series | Former titles | Legal Almanac Series | 1075-7376 | |
| Oceanides | 1560-8433 | Formerly (until 1996) | Investigaciones Marinas CICIMAR | 0186-5102 |
| Oeppet Hus | 1104-5337 | Formerly (until 1994) | Riksbo | 1100-0465 |
| Oestergoetlands Affaerer och Soedermanland | 1101-6779 | Formerly (until vol.8, 1990) | Oestergoetlands Affaerer | |
| Oesterreichische Drogen Zeitung | 0253-536X | Formerly (until 1979) | Oesterreichische Drogisten Zeitung | 0253-5351 |
| Of Value | Formerly | Society for Health and Human Values. Bulletin | ||
| Office and Emergency Pediatrics | 1526-9396 | Former titles (until 1999) | Emergency and Office Pediatrics | 1073-7782 |
| Office Catalogue (Hong Kong) | Formerly | Office Supplies Catalgue | ||
| Office Systems | 0263-7790 | Formerly | Office Automation Systems | |
| Officeren | 1102-6324 | Formerly (until 1991) | Fraelsningsofficeren | 0345-3774 |
| Official Directory of the Catholic Church in Australia | 1321-4764 | Former titles (until 1981) | Official Directory of the Catholic Church in Australia and New Zealand | 1321-4756 |
| Official McCallum Observer | Formerly (until l999) | McCallum Observer | 1083-2327 | |
| Official U K PlayStation Magazine | 1367-4471 | Formerly (until 1996) | Official PlayStation Magazine | 1360-2349 |
| Official U.S. PlayStation Magazine | 1094-6683 | Formerly (until 1997) | P S X | 1083-1088 |
| Offshore Journal | 1521-5644 | Formerly | Offshore, an E-journal | |
| Offshore Support Vessel Market | Formerly | World Offshore Support Vessels | ||
| Offshore Taxation Review | 1366-7564 | Formerly | Offshore Tax Planning Review | 0961-1363 |
| Ogneupory i Tekhnicheskaya Keramika | Formerly (until May 1995) | Ogneupory | 0369-7290 | |
| Oilman Weekly Newsletter | 0263-1024 | Former titles (until 1982) | Oilman Weekly News Bulletin | 0143-6708 |
| Oilseeds and Industrial Crops | Formerly | Oilseeds | 0265-0002 | |
| Okayama Law Journal | Former titles (until 1994) | Okayama Daigaku Hogakkai Zasshi - Okayama University. Association of Law. Journal | 0386-3050 | |
| Oklahoma Farm Bureau Journal | 1091-921X | Former titles (until 1995) | Farm Bureau Journal | 1077-1859 |
| Okregowa Izba Lekarska w Koszalinie. Biuletyn | 1233-5037 | Formerly | Okregowa Izba Lekarska w Koszalinie. Biuletyn Informacyjny | 1233-5215 |
| Old Farmer's Almanac Traditional Holiday Recipes, The | Formerly | Old Farmer's Almanac Good Cook's Companion | ||
| Oldenburger Jahrbuch | 0340-4447 | Former titles (until 1957) | Oldenburger Landesverein fuer Geschichte, Natur- und Heimatkunde. Oldenburger Jahrbuch | 0932-7363 |
| Older Car Blue Book | Former titles | Older Car Red Book | 1074-181X | |
| Oldtimer Handel | Former titles | Auto und Motorrad Oldtimer | ||
| Omkring Gudstjenesten | 0908-0740 | Former titles (until 1993) | Kirkefondets Studiemappe | 0906-3781 |
| Omvaardaren | 0280-4123 | Former titles (until 1974) | Svensk Sjukskoeterskefoerening - Pedagogiska Sektionens Medlemsblad | |
| OmVaerlden | Former titles | S I D A Rapport | 0282-6011 | |
| On Premise | 1051-4562 | Formerly (until 1990) | TopShelf | 0749-2022 |
| On Production | 1097-7260 | Former titles (until 1997) | Variety's On Production | 1088-1522 |
| On Wall Street | Formerly (until Apr. 1996) | Financial Planning on Wall Street | 1074-4282 | |
| Oncology & Chemotherapy | 0913-9834 | Formerly (until 1986) | Research Society on Oncology and Chemotherapy in Gynecology | 0912-1013 |
| Onderzoek en Beleid | 0923-6414 | Former titles (until 1989) | W O D C | 0923-6406 |
| One | 1095-1717 | Formerly (until 1998) | Sandesah | 1082-0620 |
| One in Seven | 1460-0811 | Former titles (until 1997) | See Hear! | 0968-5529 |
| One Institute - I G L A Bulletin | Formerly | I G L A Bulletin | ||
| One Lime Street | 0969-7810 | Formerly (until 1993) | Lloyd's Log | 0024-550X |
| Online Files: Comparative Cost Analysis | 0967-6090 | Formerly (until 1992) | Clover Comparative Cost Chart for Online Files | 0959-5619 |
| Online Help Journal | Formerly (until 1998) | WinHelp Journal | ||
| Online Insider | Formerly (until 1998) | Seidman's Online Insider | ||
| Online Today | 1437-6644 | Formerly (until 1998) | T V Today Online und Computer | 1435-2648 |
| Ontario Deaf Life | Formerly | Ontario Association of the Deaf News | ||
| Ontario Farm & Country Accommodations. Bed & Breakfast Farm Vacation Directory | Formerly (until 1999) | Ontario Farm and Country Accommodations Directory | ||
| Ontario Whitewater | Formerly | Ontario Wildwater Affiliation. Race Book | ||
| Ontario. Ministry of Agriculture, Food and Rural Affairs. Agri-Food Trade Update | Formerly | Ontario. Ministry of Agriculture and Food. Agri-Food Trade Update | 1183-1588 | |
| Ontario. Ministry of Agriculture, Food and Rural Affairs. Fruit Tree Survey Part 1: Grapes (Year) | Former titles | Ontario. Ministry of Agriculture, Food and Rural Analysis. Fruit Tree Census Part 1: Grapes (Year) | ||
| Ontario. Ministry of Agriculture, Food and Rural Affairs. Fruit Tree Survey Part 2: Tender Fruit (Year) | Former titles | Ontario. Ministry of Agriculture, Food and Rural Analysis. Fruit Tree Census Part 2: Tender Fruit (Year) | ||
| Ontario. Ministry of Agriculture, Food and Rural Affairs. Fruit Tree Survey Part 3: Apples (Year) | Former titles | Ontario. Ministry of Agriculture, Food and Rural Analysis. Fruit Tree Census Part 3: Apples (Year) | ||
| Ontario. Ministry of Agriculture, Food and Rural Affairs. Grain Letter | 0843-6533 | Former titles | Ontario. Ministry of Agriculture, Food and Rural Analysis. Grain Letter | |
| Ontario. Ministry of Agriculture, Food and Rural Affairs. Seasonal Fruit and Vegetable Report | Former titles | Ontario. Ministry of Agriculture, Food and Rural Analysis. Seasonal Fruit and Vegetable Report | ||
| Oogst Tuinbouw | Supersedes in part | Oogst | 0923-0769 | |
| Oor | 0921-1616 | Formerly (until 1984) | Muziekkrant Oor | 0301-6501 |
| Oos-Kaap. Provinsiale Koerant | Supersedes in part | Kaap die Goeie Hoop. Provinsiale Koerant - Cape of Good Hope. Provincial Gazette | ||
| Oos-Transvaal. Provinsiale Koerant | Supersedes in part | Transvaal. Provinsiale Koerant | ||
| Open House International | 0168-2601 | Formerly (until 1983) | Open House | 0921-3864 |
| Openings Online | Formerly (until 1998) | Openings | ||
| Optics Report | 1076-5700 | Supersedes | Laser Bulletin | 1074-715X |
| Optimist (St. Louis) | 1085-5017 | Formerly | Optimist Magazine | 0744-4672 |
| Options Mediterraneennes. Serie B: Etudes et Recherches | 1016-1228 | Supersedes in part (in 1989) | Options Mediterraneennes. Serie Etudes | 0253-1542 |
| Optometry: Journal of the American Optomoteric Association | Formerly | American Optometric Association. Journal | 0003-0244 | |
| Oral Hygiene: The International Market | Formerly | Oral Hygiene Products: The International Market | ||
| Oralia | Formerly | Script Oralia | 0940-0303 | |
| Orange County Business and Industrial Directory | 1059-7077 | Former titles | Orange County Business Directory | |
| Orange County Lawyer | 0897-5698 | Former titles (until 1988) | Orange County Bar Association. Bulletin | 0279-9243 |
| Orange County Technology Guide (Year) | Formerly (until 1995) | Greater Orange County Technology Resource Guide (Year) | 1060-1627 | |
| Oranje - Schakel | Formerly (until 1994) | Oranjevaan | ||
| Orbit | 1440-4893 | Supersedes in part (in 1998) | School Magazine | 0155-1108 |
| Oregon Manufacturers Register | 1071-6890 | Formerly | Oregon Manufacturers Directory | |
| Oregon Outside | 1083-9348 | Formerly (until 1995) | Oregon Parks | 1081-4493 |
| Organic AlterNETive | Formerly | AlterNETive | ||
| Organic Farming | 1464-1224 | Formerly (until 1998) | New Farmer and Grower | 0952-1402 |
| Organic Report | Formerly (until 1994) | Organic Foods Production Association of North America. Newsletter | ||
| Organisations Concerned with Health and Safety Information | Formerly (until 1998) | Directory of Organisations Concerned with Health and Safety Information | ||
| Organizational Systems Research Association. Conference Proceedings | Formerly | Office Systems Research Association. Conference Proceedings | ||
| Orientalistik Bibliographien und Dokumentationen | Formerly | Orientalistik Bibliographien | 1432-3338 | |
| Orientering | 0800-6067 | Formerly (until 1984) | Norges Orienteringsforbund Posten | 0333-1490 |
| Origination News Monthly | 1083-8481 | Formerly | Managing Mortgages | 1060-9318 |
| Origins Design | Formerly | Origins Research | 0748-9919 | |
| Orion Afield | 1096-9144 | Formerly (until 1997) | Orion Society Notebook | |
| Oroscopo | Formerly | Oroscopo della Settimana | ||
| Orthodontic Waves | 1344-0241 | Formerly (until 1998) | Nihon Kyosei Shika Gakkai Zasshi | 0021-454X |
| Orthopaedie und Rheuma Praxisinformation | 1435-0017 | Formerly | Orthopaedie und Rheuma Nachrichten | |
| Osaka Daigaku Chodendo Erekutoronikusu Kenkyu Senta Hokoku | 0919-3952 | Formerly (until 1990) | Osaka Daigaku Chodendo Kogaku Jikken Senta Hokoku - Osaka University. Laboratory for Applied Superconductivity. Annual Progress Report | |
| Osaka Kukusai Joshi Daigaku Kiyo | 1340-2943 | Formerly (until 1993) | Teikoku Gakuen Kiyo - Bulletin of Teikoku Gakuen | 0385-8553 |
| Ost-West Europaeische Perspektiven | Former titles (until 1999) | Katholischer Arbeitskreis fuer Zeitgeschichtliche Fragen. Ost-West Informationsdienst | 0939-3137 | |
| Ostrich News Ratite Directory | 1068-5774 | Former titles (until 1992) | National Ostrich - Ratite Directory | 1050-981X |
| OtNow | Formerly | National (Ottawa, 1979) | 0820-3008 | |
| Oto-Rino-Laringologia | 1223-2505 | Formerly | Revista de Chirurgie, Oncologie, Radiologie, ORL, Oftalmologie, Stomatologie. Oto-rino-laringologia | 1220-0867 |
| Ottar | 0349-6546 | Former titles (until 1981) | R F S U - Bulletin | 0348-6419 |
| Ottawa Update | Formerly | Ottawa Weekly Update | 0840-9196 | |
| Our Legacy | Formerly | Recreation Reporter | ||
| Our World 50 Plus | Formerly | Seniors' World | ||
| Outcomes and Accountability Alert | Former titles (until 1999) | Behavioral Health Outcomes | 1090-9621 | |
| Outdoor America | 0021-3314 | Incorporates | League Leader | |
| Outside's Sport & Travel Guides | Formerly | Outside's Sport & Travel Guides | ||
| Outsourcing Center | Formerly | Infoserver | ||
| Overdrive Truck Stop and Travel Guide | Formerly | N T S Fuel and Services Directory | ||
| Overseas Post. Consumer Goods | 0942-6337 | Former titles (until 1991) | Overseas Post. Product and Design | 0940-5356 |
| Overseas Travel Planner | Former titles | Educational Travel Resource Guide | ||
| Owner Operator | 1099-4246 | Incorporates (in 1999) | Truck Owner | |
| Oxford Editions of Cuneiform Texts | 0309-0701 | Formerly | Oxford Editions of Cuneiform Inscriptions | |
| Oxford Monographs on Geology and Geophysics | 0952-7028 | Formerly (until 1985) | Oxford Geological Sciences Series | |
| Oz Clark's Wine Guide (Year) | 1352-1195 | Formerly (until 1992) | Websters Wine Guide | 0957-7777 |