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(free) 333-page technical document on sound restoration titled "Manual of Analog Sound Restoration Techniques." It's written by Peter Copeland of The National Sound Archive in England (part of the British Library Board), and it's a remarkable and interesting document.
I don't agree with everything Copeland says, but he makes a number of good points in his report, and there's a lot of very good information in it, particularly on vinyl restoration techniques. Apparently Copeland died in 2006 without finishing the manuscript; parts of it are in desperate need of editing, and the info is dated in sports, but there's still a treasure-trove of good information there. Note that Copeland's approach is very scientific and engineering-based; subjective audiophiles may take issue with some of his opinions.
It's available as a free PDF at this link:
http://www.bl.uk/collections/sound-archive/pdf/analoguesoundrestoration.pdf
Copeland reportedly put about ten years of research into writing the document, and it's very well-done. Anybody who's trying to do restoration and mastering of vinyl, 78RPM discs, and analog tape should read it.
