Group evaluation of dual lens aperture card readers : Carl Zeiss Dokumator DL 5/2, Marshall Smith Multi-View Mk. 3, Microbox MLK 2, sfs Saul Merkus 2S, Zeutschel Systematic 606K /
National Reprographic Centre for Documentation.
Hatfield, Herts. : National Reprographic Centre for documentation,
c1978.
Cover title.
Microfilm readers.
Microfilm aperture card systems