21. [Recordak 35mm model D with daeger style book holder] Publication: [196-?] Subject(s): MicrofilmingAfrican AmericansNational Library of Medicine (U.S.). Reference Services Division.
22. [Microfilming with a Recordak 35mm] Publication: [1969?] Subject(s): MicrofilmingNational Library of Medicine (U.S.). Reference Services Division.
23. [Selecting material for microfilming] Publication: [1969?] Subject(s): MicrofilmingNational Library of Medicine (U.S.). Reference Services Division.
24. [Haloid Xerox copy flo machine] Publication: [1969?] Subject(s): MicrofilmingAfrican AmericansNational Library of Medicine (U.S.). Reference Services Division.
25. [RSD/PSD mobile camera in the stack area] Publication: [196-?] Subject(s): MicrofilmingAfrican AmericansNational Library of Medicine (U.S.). Reference Services Division.