These three books are from the Typewriters Group:

• THE TYPEWRITER SKETCHBOOK by Paul Robert with Flavio Mantelli,  Richard Milton, and Peter Weil
  (High quality color photographs and illustrations of pieces on the history and workings of Hammonds, Ingersolls, and many many more early typewriters)
  Order at:    http://www.lulu.com/content/1370470
• THE CALIGRAPH PUBLICATIONS
  (On the first three years of Caligraph history and production; includes the truly extremely rare Caligraph Quarterly issues that are known to exist, the first known Caligraph operator’s manual, and much much more.)
  Can be ordered at:        http://www.lulu.com/browse/preview.php?fCID=1395526
• STOLEN TYPEWRITERS AND RELATED STORIES by Mike Brown
  Can be ordered at:        http://www.geocities.com/typewriterexchange/Office.htm