we'll share them with you all. 

INTAGLIO:
Practical Guide to Etching and Other Intaglio Printmaking Techniques / (ISBN 10: 0486251659 / ISBN 13: 9780486251653 ) / Manly Banister / Published by Dover, might be out of print
LETTERPRESS:
"General Printing, An illustrated Guide to Letterpress Printing"
Cleeton, Pitkin & Cornwell / Liber Apertus Press / ISBN 0-9785881-4-2
Good supplier for intaglio and general printmaking is Graphic Chemical and Ink in Chicago: https://www.graphicchemical.com
Good supplier for letterpress tools, equiptment and kowledge: John Barrett at Letterpress  Things in Chicopee, MA / http://letterpressthings.com
+ "American" in Long Island seems to have everything for production printing:
http://www.americanprintingequipment.com