Columbia subject headings:
Libraries--Special collections--Microforms--Handbooks, manuals, etc.
Microfilm readers--Maintenance and repair--Handbooks, manuals, etc.
Reader-printers (Microphotography)--Maintenance and repair--Handbooks, manuals, etc.
Harvard subject headings:
Libraries--Special collections--Microforms--Handbooks, manuals, etc.
Microfilm readers--Maintenance and repair--Handbooks, manuals, etc.
Reader-printers (Microphotography)--Maintenance and repair--Handbooks, manuals, etc.
Princeton subject headings: