21. Struve, N. A. Creator: From the Collection: Filippov, Boris, 1905-1991 Published / Created: 1962-69 Call Number: GEN MSS 334 Container / Volume: Box 9, folder 256-257 Image Count: 44 Found in: Beinecke Rare Book and Manuscript Library > Boris Filippov papers (GEN MSS 334) > 1969 Acquisition > Correspondence > Struve, N. A.
22. Sweeney, James Johnson Creator: From the Collection: Gabo, Naum, 1890-1977 Published / Created: 1939-1980 Call Number: YCAL MSS 541 Container / Volume: Box 25 Image Count: 17 Found in: Beinecke Rare Book and Manuscript Library > Naum Gabo papers (YCAL MSS 541) > Series I: Correspondence > General Correspondence > Sweeney, James Johnson
23. The Circle Creator: From the Collection: Gabo, Naum, 1890-1977 Published / Created: 1939-1980 Call Number: YCAL MSS 541 Container / Volume: Box 32 Image Count: 10 Found in: Beinecke Rare Book and Manuscript Library > Naum Gabo papers (YCAL MSS 541) > Series I: Correspondence > Projects > The Circle