Art Glass Shades: Pre-1930 Original or Modern Copy?

Title: 
Art Glass Shades: Pre-1930 Original or Modern Copy?
Author/Artist: 
Chervenka, Mark.
Published In: 
Antique & Collectors Reproduction News, v. 10, no. 9, Sept. 2001, pp. 97-101, ill. 1065-3694
Bib ID: 
AI52738
Notes: 
Includes marks on typical vintage shades.