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countable and uncountable, plural microfilms
a continuous roll of film containing photographs of documents at a greatly reduced size examples
third-person singular simple present microfilms, present participle microfilming, simple past and past participle microfilmed
To reproduce (documents) on such film. quotations examples
Power set up a camera in the British Museum and eventually microfilmed many pre-1640 English books that he selected from Pollard and Redgrave’s Short-Title Catalogue (STC) and other important works in the museum’s collections.
1972, Carol A. Nemeyer, Scholarly Reprint Publishing in the United States, New York, N.Y.: R. R. Bowker Co., pages 48–49