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The use of microfilm provided access to heavily used records while preserving the original documents.
en.wikipedia.org The airgraph forms, upon which the letter was written, were photographed and then sent as negatives on rolls of microfilm.
en.wikipedia.org It holds 80,000 family history books, 100,000 local history items, 565,000 rolls of microfilm, and 7,000 maps.
en.wikipedia.org He is estimated to have read 25,000 microfilm reels of mostly major newspapers.
en.wikipedia.org Three formats are common: microfilm (reels), aperture cards and microfiche (flat sheets).
en.wikipedia.org