Books by Sergius Yakobson:
Books in the extended shelves:
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Yakobson, Sergius, 1901-: Aspects of intellectual ferment in the Soviet Union (U.S. Govt. Print. Off., 1966), also by Robert V. Allen and Library of Congress Legislative Reference Service (page images at HathiTrust)- Yakobson, Sergius, 1901-: Über die Sittenverderbnis in Russland (R. Kittler, 1925), also by M. M. Shcherbatov, Ina Friedlaender, and Karl Stählin (page images at HathiTrust)
Find more by Sergius Yakobson at your library, or elsewhere.