Reproduction: "An exact copy of the content of a resource made by mechanical or electronic means." [RDA Glossary]
LC-PCC PS 27.1. "The word “reproduction” is being used in its broadest sense to include all resources formerly identified as reproductions, republications, reprints, reissues, facsimiles, etc., that still represent equivalent content between an original resource and a reproduction of that original. Revised editions represent different expressions and are not treated as reproductions."
Here are collected instructions for cataloging tangible print resources: facsimile reprints (monograph and serial), photocopies, and microform. The instructions are based on RDA and, if available, the LC PCC Policy Statements. Guidelines for cataloging remote access reproductions (online resources) are covered by the PCC's Provider-Neutral (PN) instructions. PN instructions do not apply to direct access electronic resources. Because these are uncommon, detailed instructions are not given, but would follow the same principles applied to tangible print resources.
Under RDA, cataloging tangible resources as reproductions introduces linking fields 775/776 to replace MARC 533 and 534. We will not make reciprocal linking fields in the records for the original resource if these exist in Orbis (or in LC or OCLC), whether the reproduction is a facsimile, reprint, or microfilm.
Staff new to RDA cataloging may find the checklist for Minimal Level Cataloging to be helpful.
Microform Reproductions (Caution: these guidelines are not treated like PS 27.1)