Guidelines for Preservation: Photocopying of Replacement Pages
Source: Association for Library Collections & Technical Services, a division of ALA
Photocopied replacement pages are required when parts of original texts have been removed or lost. Photocopying also becomes necessary when an embrittled item can no longer be used without risking damage, and a paper copy replacement (rather than film) is desired and is not available from a commercial publisher. In each case, it is essential that photocopies be of the highest quality.
This document was first drafted as part of a Research Libraries Group Preservation Committee initiative. It has evolved into the present guideline through the work of the ALA/ALCTS/PLMS Physical Quality and Treatment of Library Materials Committee. (1990)