21. [Librarian sets up a video in the audiovisual area] Publication: [197-?] Subject(s): Catalogs, LibraryLibrariansNational Library of Medicine (U.S.). Reference Services Division.
22. [Reference librarian cues video] Publication: [197-?] Subject(s): Catalogs, LibraryLibrariansNational Library of Medicine (U.S.). Reference Services Division.
23. Multimedia reference resource card catalog Publication: [197-?] Subject(s): Catalogs, LibraryNational Library of Medicine (U.S.). Reference Services Division.
24. [APGO teaching package] Publication: 1974 Subject(s): Association of Professors of Gynecology and Obstetrics.National Library of Medicine (U.S.). Reference Services Division.
25. [Watching a video tape in the AV area] Publication: [197-?] Subject(s): Catalogs, LibraryNational Library of Medicine (U.S.). Reference Services Division.
26. Audiovisual learning resource area Publication: 1977 Subject(s): Libraries, MedicalNational Library of Medicine (U.S.). Reference Services Division.
27. [Audiovisual learning resource] Publication: 1977 Subject(s): Libraries, MedicalNational Library of Medicine (U.S.). Reference Services Division.
29. [Classification listing in the AV area] Publication: 1977 Subject(s): Libraries, MedicalNational Library of Medicine (U.S.). Reference Services Division.
30. Audio-visual carrel Publication: [197-?] Subject(s): National Library of Medicine (U.S.). Reference Services Division.