MARC21-007: Generation of microform
first generation (master)
Camera master or COM recorder master.
a
Used for all master films that are made on archival stock in accordance with archival productions standards and that are given archival storage under relevant ISO standards.
mixed generation
A combination of generations of film.
m
printing master
Any generation employed mainly for the production of other microforms.
b
Used for all masters that are not manufactured, produced, and stored in accordance with archival standards.
service copy
Microform made from another microform that is intended primarily for use rather than for production of other microforms.
c
Always used for microopaques.
unknown
Generation aspect is not known.
u
Published