Columbia subject headings:
Archival materials--Reproduction.
Books on microfilm--Standards.
Books on microfilm.
Documents on microfilm--Standards.
Documents on microfilm.
Library materials--Reproduction.
Microfilms--Library applications.
Microfilms.
Micrographics--Library applications.
Micrographics.
Harvard subject headings:
Archival materials--Reproduction
Books on microfilm.
Documents on microfilm.
Library materials--Reproduction.
Microfilms.
Micrographics.
Princeton subject headings:
Preservation microfilming.