USA Paper Money Errors.. New 3rd Edition
This edition is awesome, has it all, it is a comprehensive catalog and price guide by Dr. Frederick J. Bart.
Published by KP Krause Publications an imprint of F+W Media. Over 500 B&W detailed images-photos. 296 pages. Retails @ $26.99
"All the Books I have mentioned in this forum, I own and have purchased."
The more you read then reread.. will make one a knowledgable collector.
AND.... knowledge should be apparent in a sellers offerings, nuff said.