Museums and Public Art Galleries:
 Museum of Modern Art, New York City
A total of about 10 works are viewable online
National Gallery of Canada, Ottawa
Let Us Fulfill the Plan of the Great Projects
San Francisco Museum of Modern Art
2 works online
Courtauld Institute of Art, London, UK
2 works online
Museum of Fine Arts, Santa Fe, New Mexico
Self-Portrait with Kulagina for Socialistic Construction, ca.1926
State Museum of Contemporary Art, Thessaloniki, Greece NEW!
Pictures from Image Archives:
California State University WorldImages Database
3 works online
Articles and Reference Sites:
Answers.com reference works 
The "Art Encyclopedia" entry is from the Concise Grove Dictionary of Art (2002). The "Photography Encyclopedia" entry is from the The Oxford Companion to the Photograph (2005).
Wikipedia, the "Open Content" Encyclopedia
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