Paintings in Museums and Public Art Galleries:
Art Institute of Chicago Collection Database 2 works by Oskar Schlemmer online
Dallas Museum of Art, Texas
Fine Arts Museums of San Francisco Half Length Figure turned to right, 1914-19 Head in Profile, with Black Contour, 1920-21 Figurenplan (Figure Plane), 1919-20
Museum of Modern Art, New York City
Norton Simon Museum, Pasadena, California
Bauhaus-Archiv Museum of Design, Berlin Description of Oskar Schlemmer's classes taught at the Bauhaus school
Cleveland Museum of Art, Ohio
Harvard University Art Museums, Massachusetts
MUMOK - Museum Moderner Kunst Stiftung Ludwig Wien, Vienna (You need to click the "right" arrow twelve times)
Museo di Arte Moderna e Contemporanea, Trento, Italy (in Italian) 
Museum of Modern Art, New York City - Provenance Research Project Head, 1928 Bauhaus Stairway, 1932
Neue Galerie Museum for German and Austrian Art, New York City Click "Collection" > "View the collection" > "Artists" > "Oskar Schlemmer"
Saint Louis Art Museum, Missouri Before the Mirror, 1931
Schleswig-Holstein Museums, Germany 1 work online
Von der Heydt-Museum, Wuppertal, Germany (in German) 
Pictures from Image Archives:
Bildindex der Kunst und Architektur (in German)  (a welcome screen is displayed for a couple of seconds before the search results appear)
California State University WorldImages Database
Ciudad de la Pintura (in Spanish) 
University of Michigan SILS Art Image Browser
Articles:
Union List of Artist Names (Getty Museum) Reference sheet with basic information about the artist and pointers to other references.
The Guardian Newspaper, UK The Bauhaus Stairway, 1932
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