#microfilm  film on which materials are photographed at greatly reduced size; useful for storage; a magnification system is used to read the material
  supertype:  photographic_film__film  photographic material consisting of a base of celluloid covered with a photographic emulsion; used to make negatives or transparencies
  subtype:  microfiche  small sheet of microfilm on which many pages of material have been photographed; a magnification system is used to read the material

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