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It general, we are expected to continue following the LC-PCC PS for Facsimiles and Reproduction for the original RDA Toolkit as modified for OCLC, until the new RDA Toolkit (LRM version) has been more thoroughly field-tested for cataloging microforms and other reproductions (and given that microfilming for preservation purposes is being replaced by phased out in favor of digitization, this may not happen for a while).
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