Tells the fascinating and complex story of the proprietary coils developed by manufacturers of stamp vending and affixing machines in the early 20th Century.  Covers more than 250 major varieties of coil stamps made by the six companies that created these perforations, discusses their history and proprietary perforations, stamps to which the perforations were applied, scarcity of these stamps on and off cover, and factors to be considered to identify the many fakes of these coils.  Illustrated in full color; 220 pages (2009), Hardbound.

Perfect bound. The standard plate number reference for all United States and overprinted Possessions postage, revenue and back of the book stamps listed in theScott Specialized catalog.  Includes full-color illustrations of marginal markings and data on coil, sheet and booklets, 442 pages, 8.5 x 11.

The book focuses on the stamps and their closely associated collection cards and booklets. Background information is provided to understand the operation of these systems from its beginning in 1910 to an eventual demise in 1970. The book covers essays, proofs, sheet stamps, booklets and coils, as well as official mail stamps and stationery. Illustrated in full color; 245 pages (2012), Paperbound, 6×9.

Encyclopedia of United States Stamps and Stamp Collecting, Second Edition. The most comprehensive introduction and guide to United States Stamps ever written; fully revised and updated; for beginners and veteran collectors alike. Illustrated in full color; 769 pages (2016), hardbound, 9.3×6.5in.