Standard Catalog of Firearms 6th Edition 1996
Standard Catalog of Firearms 6th edition from 1996: The Collector’s Price and & Reference Guide - Values of more than 12,000 guns. From The Publishers of Gun List by Ned Schwing and Herbert House - It appears Michael used this set of books for much of his reference on fine shotguns. Published by Krause Publications, Iola, WI. 1 unsigned copy.