PATTERN GLASS - This site has lots of photos and lots of information about pattern glass.
SPARKLE PLENTY - This site has information about a variety of types of glass. Has lots of photos too.
GLASS AND POTTERY SELLERS - The glass and pottery sellers site is excellent for getting an education in all types of glassware.
RUBY LANE -This a link to my shop on Ruby Lane. Ruby Lane (not just my shop) is a site I have used for many years to help me identify antiques and collectibles. The descriptions are accurate and there is a variety of glassware and collectibles from all eras.
OLD AND SOLD - This site has a library of articles about glassware and collectibles.
ALL ANTIQUE GLASS - There are lots of photos of EAPG and other types of glass. Prices are reliable and information is accurate.
TIAS - This is a selling site but it has a lot of items and I have found the descriptions accurate and the prices in line with other sites.