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 Stanford 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.

University of Washington Audio Preservation and Restoration by John R. Gibbs.

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

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

Valerie Forrestal’s http://www.audioarchiving.net/ is a great bibliographic resource on preservation reformatting.

Henry Wilhelm’s Wilhelm Imaging Research site also has his landmark 1993 book The Permanence and Care of Color Photographs: Traditional and Digital Color Prints, Color Negatives, Slides, and Motion Pictures available as an 80 MB PDF. I’ve had the book since it first came out.

Useful film and video tools: Scene Savers, Cincinnati