When we think of Depression Glass, we usually think of the popular dishware manufactured during that period. Many glass companies at that time also made jars, lamps bases, and bowls for lighting fixtures. If you are trying to identify your glass there are many resources available including books such as:
"Antique Lamp Buyer's Guide: Identifying Late 19th Century and Early 20th Century American Lighting" by Nadja Meril
"Antique Trader Lamps and Lighting Price Guide" by Kyle Husfloen
"Early 20th Century Lighting Fixtures Featuring Gas and Electric, Ceiling, Wall, Table, and Art Glass Fixtures" by Jo Ann Thomas
"Lighting Fixtures of the Depression Era" by Jo Ann Thomas
Do not rely on older price guides as they will not reflect current values.
You can also check out the Corning Museum of Glass, a site that offers a wealth of information on glass. Find a glass club online or in your area for more information.