The late Peter Copeland wrote a handbook concerning analogue sound restoration. It is required reading. When Peter died in 2006, I despaired that this would ever see the light of day. In 2008-09, the British Library released it as a free PDF file available here.

The IASA “Green Book” TC-04 Guidelines on the Production and Preservation of Digital Audio Objects can be purchased from IASA. The Second Edition is available online.

The CoOL (Conservation On Line) site has many resources. In particular, read Gilles St-Laurent’s 1996 article on The Care and Handling of Recorded Sound Materials.

The National Recording Preservation Board of the Library of Congress and the Council on Library and Information Resources March 2006 Capturing Analog Sound for Digital Preservation: Report of a Roundtable Discussion of Best Practices for Transferring Analog Discs and Tapes