| #261 | American dyestuff reporter. -- Secaucus : SAF International, 1917-2000. -- ISSN 0002-8266 |
| #262 | American foundryman. -- UNITED STATES : [Des Plaines, Ill., etc., American Foundrymen's Society, etc.], 1938-1955. -- ISSN 0096-9028 |
| #263 | American gas. -- Arlington : American Gas Association, 1989-. -- ISSN 1043-0652 |
| #264 | American Gas Association Monthly. -- UNITED STATES : [Arlington, Va., etc., American Gas Association], 1919-1984. -- ISSN 0002-8584 |
| #265 | American gas journal. -- UNITED STATES : New York : American Gas Light Journal, 1921-1970., 1921-1970. -- ISSN 0096-4409 |
| #266 | American glass review. -- Pittsburgh : Commoner, 1926-. -- ISSN 0002-8649 |
| #267 | American Horologist and Jeweler. -- UNITED STATES : [Denver, Colo., Roberts Pub. Co.], 1946-1980. -- ISSN 0002-8797 |
| #268 | American Industrial Hygiene Association journal. -- Baltimore : Williams & Wilkins, 1958-1999. -- ISSN 0002-8894 |
| #269 | American Industrial Hygiene Association quarterly. -- UNITED STATES : Chicago, Ill. : The Association., 1946-1957. -- ISSN 0096-820X |
| #270 | American journal of mathematics. -- Baltimore : Johns Hopkins University, 1878-. -- ISSN 0002-9327 print. -- ISSN 1080-6377 online |