ArtLex
Art Lex: The Eight
Examples of work by a group of early Modernist painters known as "The Eight." Gives a brief history of the group.
ArtLex
Art Lex: Ashcan School
Many examples of work by the group of painters known as the "Ashcan School." Brief history of the group as well.
Smithsonian Institution
Smithsonian American Art Museum: William Glackens
As part of the Smithsonian Art Museum's database of artists, this site provides biographical information on William Glackens in addition to an extensive listing of his works as displayed at the museum.
Curated OER
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Picture of "Hammerstein's Roof Garden" by William Glackens. Date, medium, dimensions, and location provided as well.