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Inscription: Unverified: Printed in ink on mount, recto BC: "U.S. // Engineer Department. // Geological Exploration. // Fortieth Parallel. // T.H. O'Sullivan, Photographer"; stamped on mount, verso: "Slater Memorial Museum, Norwich, Conn."
[Charles Isaacs]; Gilman Paper Company Collection, New York, June 11, 1991
From the King Expedition, 1867-72.
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