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Sigmund Freud, 1921 (Max Halberstadt, photographer) Library of Congress/Courtesy of A.W. Freud et al.

"The Moses of Michaelangelo" Holograph manuscript and pen and ink sketch, 1914 Sigmund Freud Collection, Manuscript Division, Library of Congress

Sigmund Freud, 1929 Library of Congress/ Courtesy of A.W Freud et al.

Manuscript page from the Ego and the Id, published in 1923. Sigmund Freud Collection, Manuscript Division, Library of Congress. Photo: Library of Congress/Courtesy of A.W. Freud et al.

Sigmund Freud at Clark University, Worcester, Massachusetts, September 1909. Sigmund Freud Collection, Prints and Photographs Division, Library of Congress. Photo: Library of Congress/Courtesy of A.W. Freud et al.

Manuscript page from Civilization and Its Discontents, 1930. Sigmund Freud Collection, Manuscript Division, Library of Congress. Photo: Library of Congress/Courtesy of A.W. Freud et al.

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