There are many great reference books available for Depression Glass.  If you are looking for glass valuations, each author has their own method for determining value, so having a few different author’s books for comparison is a good idea.  You will then obtain the best idea of the worth of your glass. 

Here are my favorites:

Collector’s Encyclopedia of Depression Glass, 19th Edition, by Cathy and Gene Florence (paid link)

Colored Glassware of the Depression Era, Book 2, by Hazel Marie Weatherman (paid link)

Depression Glass: A Collector’s Guide, Seventh edition, by Doris Yeske (paid link)

Florence’s Glassware Pattern Identification Guide, by Gene Florence (paid link)

Florence’s Glassware Pattern Identification Guide Volume 2, by Gene Florence (paid link)

Florence’s Glassware Pattern Identification Guide Volume 3, by Gene Florence (paid link)

Hazel-Atlas Glass Identification & Value Guide, Second Edition, by Gene and Cathy Florence (paid link)

Kitchen Glassware of the Depression Years, Seventh Edition, by Gene Florence (paid link)

Kovels’ Depression Glass and Dinnerware Price List, 8th edition, by Ralph Kovel (paid link)

Mauzy’s Depression Glass: A Photographic Reference with Prices, by Barbara Mauzy (paid link)

Pocket Guide to Depression Glass & More, Sixteenth Edition, by Gene Florence (paid link)

Treasures Of Very Rare Depression Glass, by Gene Florence (paid link)

Warman’s Depression Glass: Identification and Value Guide, Fifth edition, by Ellen T. Schroy (paid link)

Warman’s Depression Glass Field Guide: Values and Identification, Third edition, by Ellen T. Schroy (paid link)

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