After years of collecting, researching and photographing powder horns, my book on Pennsylvania Screw-Tip powder horns Pennsylvania "Horns of the Trade" Screw-tip Powder Horns and their Architecture was published in 2012.
This high quality, coffee table style book is the definitive resource for identifying original Pennsylvania screw-tip horns and provides the most complete and best information available for horn makers and students of powder horns to understand the original screw-tip powder horns. There are over 440 color photos, with close-ups of both ends of each featured horn, along with general dimensions for the tips and butts of these significant powder horns.
As of March 2023, the last eight remaining copies of my book are available from Crazy Crow Trading Post on line at: http://www.crazycrow.com/crafts/pennsylvania-horns-of-the-trade-book-preview.php
A. J. DeCamp Custom Powder Horns