[The following excerpt is published courtesy of DLRC Press and its author, John Feigenbaum. This information was originally published in 1994 in The Complete Guide to Washington Quarters.]
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The date and mint-mark photography was provided by Tom Mulvaney. He is responsible for nearly all the photos without credit lines. Most of the remaining photos, which include a number of the errors and nearly every variety shown were provided by Bill Fivaz and J.T. Stanton whose contribution was invaluable to this book.
A special thanks goes to Charles Kirtley, a specialist in medals and tokens, and J.P. Martin of the American Numismatic Association who provided special sections in their respective fields of expertise and to Elliot Goldman of Allstate Rare Coins for his foreword and valuable comments on certain dates.
I would also like to extend my appreciation to my mother Lynn for providing her professional editing expertise (which, I have to admit, was sorely needed).
The following people were also very helpful and provided the use of their coins and/or very useful information and insight to the preparation of this book: Phil Carrigan, Barbara Gregory, Earl Hawthorne, Bill Kemp, David Lawrence, Robert Lehmann, Harry Miller, Paul Neuenkirk, Fred Weinberg, David Woloch and J.J. Woodside.
Thanks also to the following institutions for providing access and permission to their archives: American Numismatic Association Library and Authentication Bureau and the Smithsonian Institution National Museum of American History.
The following organizations provided permission to reprint information from their publications: Western Publishing Company – A Guidebook of United States Coins by R.S. Yoeman; Numismatic Guaranty Corp. – NGC Census; CDN, Inc. – The Coin Dealer Newsletter and Monthly Summary; Amos Press – Coin World; Krause Publications – Numismatic News; American Numismatic Association – The Numismatist.