Microfilm readers
Publisher: National Micrographics Association
Published: 1979
Place of publication: Silver Spring, Md
Language: eng
Copyright date: 1979
Subjects: Microfilm readers; Standards
Notes: "ANSI/NMA MS20-1979 (revision of ANSI PH5.1-1959, rev. 1970); approved September 13, 1979 as an American National Standard."