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MARC21-007: Category of material
Properties Listed by Language
A generic term for any medium, transparent or opaque, bearing microimages. A microimage is a unit (e.g., a page) of textual, graphic, or computer-generated material that is contained on aperture cards, microfiche, microfilm, micro-opaques, or other microformats and that is too small to be read without magnification.
Microforms may be reproductions of existing textual or graphic materials or they may be original publications.
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