1937
Index 10 April 1937. For index reference, see Finding Aid [nrs.harvard.edu/urn-3:HUAM:art00006]. For additional angle theory diagrams, see also drawings, Sketchbook 12-8 through 12-14, Untitled, 1932 (Davis Catalogue Raisonné‚ nos. 494-500); Sketchbook 12-16 through 12-18, Untitled, 1932 (Davis Catalogue Raisonné‚ nos. 501-503); Sketchbook 13-18 through 13-19, Untitled, 1932 (Davis Catalogue Raisonné‚ nos. 520-521); and Sketchbook 13-26, Untitled, 1932 (Davis Catalogue Raisonné‚ no. 526).