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 a great resource for identifying original Pennsylvania screw-tip horns, AND will provide the best information available for horn makers and students of powder horns to understand the original 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.
My book is now 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
Note: I do have a limited number of copies of my book "For Sale" and on request will personalize and autograph copies for the price of $70.00, plus $10.00 postage and handling.