| #251 | Immunochemistry : an International Journal of Molecular Immunology. -- Oxford : Pergamon Press, 1964-1978. -- ISSN 0019-2791 |
| #252 | In practice : journal of veterinary postgraduate clinical study. -- London : British Veterinary Association, 1979-. -- ISSN 0263-841X print. -- ISSN 2042-7689 online |
| #253 | In vitro. -- Rockville : Tissue Culture Association, 1965-1984. -- ISSN 0073-5655 |
| #254 | Index veterinarius. -- Farnham Royal : Division of Animal Health and Medical Parasitology, 1933-. -- ISSN 0019-4123 |
| #255 | Industrial and engineering chemistry. -- Washington : American Chemical Society, 1923-1970. -- ISSN 0019-7866 print. -- ISSN 1541-5724 online |
| #256 | Information vétérinaire. -- Sainte-Hyacinthe : Collège des médecins vétérinaires du Québec, 1959-1969. -- ISSN 0581-3263 |
| #257 | International veterinary congress. -- Washington : Committee of the 12. congress, 1890- |
| #258 | Internationale Revue der gesamten Hydrobiologie und Hydrographie. -- Leipzig : Akademische Verlagsgesellschaft : Becker und Erler, 1908-1943. -- ISSN 0323-889X |
| #259 | Intervirology. -- S. Karger : Basel, 1973-. -- ISSN 0300-5526 print. -- ISSN 1423-0100 online |
| #260 | Iowa State College journal of science. -- Ames : Iowa State College Press, 1926-1959. -- ISSN 0096-2783 |