Barrett, William James.
35mm microfilming for drawing offices / by W. J. Barrett. - London : Focal Press, c1970. - 135 p. : ill. - Reprographic library .
0240506987
Microphotography.
Engineering drawings.
35mm microfilming for drawing offices / by W. J. Barrett. - London : Focal Press, c1970. - 135 p. : ill. - Reprographic library .
0240506987
Microphotography.
Engineering drawings.