: Provides a vast collection of digitized books available for free borrowing or downloading. The Impressionists by Robert Katz.
: Often host PDF files for "Импрессионизм. 100 шедевров" (Impressionism. 100 Masterpieces) and various world art encyclopedias. The French Impressionists (1860-1900) by Camille Mauclair
: Focuses on collaborative studies and educational resources.