Collector's Encyclopedia of American Art Glass (American Art Glass: Identification & Values)
In this second edition author John Shuman III deftly points out that the term art glass is a "broad and very tolerant one, taking in vast arrays of glass techniques and colors. Glassmakers were fabricating during the Victorian era and will into the Art Nouveau period according to Shuman, from around 1880 up until as late as the 1930s. He adds, "their experimentation with decoration, techniques, and materials brought creativity in glass to its apex in the United States."