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Aksel'rod, P. B. (Pavel Borisovich) (1850-1928) To Evgenii Arkad'evich Anagin [Anaguine], [v.p.], Jan. - May 1920, 5 autograph cards signed, 11 autograph post cards signed (with envelopes)
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Berlin, Isaiah, Sir To Boris Sapir, Oxford, 3 June 1965, 1 page t.l.s. (with carbon reply)
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Brandt, Willy (1913-) To Boris Sapir, Bonn, 27 June 1985 and 21 Oct. 1985, 2 t.l.s. (with copies, replies, and related materials)
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Dan, F. (Fedor) (1871-1947) To Boris Sapir, New York, 10 June and 1 July 1942, 1 a.l.s., 1 t.l.s.
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Dawidowicz, Lucy S. To Boris Sapir, Elmhurst, NY, 2 Feb. 197, 1 page t.l.s.
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Karpovich, Michael (1888-1959) To Boris Sapir, Cambridge, Mass. and New Haven, Conn, Nov. 1946 and Sept. 1958, 3 a.l.s., 1 t.l.s. (with envelope)
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Serge, Victor (1890-1947) To Boris Sapir, Mexico, Sept. 1942, 1 page t.l.s.
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Vernadsky. George (1887-1973) To Boris Sapir, New Haven, Conn., 7 Aug. 1957, 1 a.p.c.s.
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Aksel'rod, P. B. (Pavel Borisovich) (1850-1928) Photographs, [v.p.], [n.d.] and 1922-1928, 40 photographs
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Blum, Leon (1872-1950) and David Dubinsky (1892- ) Photograph, [n.p.], no date, 2.25 x 2.2 in photograph
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Breshko-Breshkovskaia, Ekaterina Konstantinovna (1944-1934) Photograph, [n.p.], [n.d.], 3.55 x 5.45 in. photograph, signed
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Kautsky, Karl (1854-1938) Photographs, [n.p.], [n.d.], 3 photographs
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Kizevetter, A.A. (Aleksandr Aleksandrovich) (1844-1934) Photographs, [n.p.], ca. 1907, 3.4 x 5.3 in. photograph
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Lavrov, P.L. (Petr Lavrovich) (1823-1900) Photograph, [n.p.], no date, 5 x 7 in. photograph
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Martov, L. (1873-1923) [IUlii Osipovich TSederbaum] Photographs, [v.p.], [n.p.] 1916-1923, 12 photographs
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Radek, Karl (1885-1939) Photographs, [n.p.], 1909-1910, 3 photographs
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Trotsky, Leon (1879-1940) Photographs, [n.p.], 1918-1939?, 3 photographs