Vanishing Ink Pennsylvania

Pennsylvania's history is reflected in its buildings, from colonial log houses to the shimmering new skyscraper skylines of Pittsburgh and Philadelphia. This booklet provides an introduction to these often-overlooked testaments to the state's past and present. (Revised edition, 1997). 79 pages, illustrations, and suggestions for further reading.

From imposters and hidden compartments to secret handshakes and coded letter, here is a thoroughly entertaining account of the role of spycraft during the American Revolution.