| #241 | American journal of neuroradiology. -- Baltimore : Williams & Wilkins, 1980-. -- ISSN 0195-6108 print. -- ISSN 1936-959X online |
| #242 | American journal of obstetrics and gynecology. -- St. Louis : Mosby, 1920-. -- ISSN 0002-9378 print. -- ISSN 1097-6868 online |
| #243 | American Journal of Obstetrics & Gynecology Mfm. -- , 2019-. -- ISSN 2589-9333 online |
| #244 | American journal of occupational therapy. -- Boston : American Occupational Therapy Association, 1947-. -- ISSN 0272-9490 print. -- ISSN 1943-7676 online |
| #245 | American journal of ophthalmology. -- New York : Elsevier Science, 1884-. -- ISSN 0002-9394 print. -- ISSN 1879-1891 online |
| #246 | American journal of orthodontics. -- St. Louis : Mosby, 1948-1986. -- ISSN 0002-9416 print. -- ISSN 1557-8488 online |
| #247 | American journal of orthodontics and dentofacial orthopedics. -- St. Louis : Mosby, 1986-. -- ISSN 0889-5406 print. -- ISSN 1097-6752 online |
| #248 | American journal of orthopsychiatry. -- Albany : American Orthopsychiatric Association, 1930-. -- ISSN 0002-9432 print. -- ISSN 1939-0025 online |
| #249 | American journal of otolaryngology. -- Philadelphia : W.B. Saunders, 1979-. -- ISSN 0196-0709 print. -- ISSN 1532-818X online |
| #250 | The American journal of pathology. -- Hagerstown : American Association of Pathologists, 1925-. -- ISSN 0002-9440 |