Brittle Book Processing | Microfilming | Preservation Microfilm Inspection
Three Generations of Microfilm | Preservation Photocopies | Photograph Preservation
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| THREE GENERATIONS OF MICROFILM | Three generations of microfilm are produced to satisfy all standards and fulfill all requirements for preservation microfilming: a master negative, a duplicate negative, and a positive service copy. Master negatives are stored under archival conditions at the National Underground Storage facility in Boyers, Pennsylvania; duplicate negatives are stored off-site at Preservation Resources, our principal microfilmer; and positive service copies are available for use in the Microform Reading Room. |