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At the Institute’s core is the Gilder Lehrman Collection, one of the great archives in American history. More than 85,000 items cover five hundred years of American history, from Columbus’s 1493 letter describing the New World through the end of the twentieth century.

O'Sullivan, Timothy H., 1840-1882 Detachment 50th N.Y. Vol. Engineers, Pontoon Wagon and Saddleboat. [March 1864 ca.]

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Gilder Lehrman Collection #: GLC05111.01.0267 Author/Creator: O'Sullivan, Timothy H., 1840-1882 Place Written: s.l. Type: Photograph Date: 1864/03 ca. Pagination: 1 photograph ; 45.7 x 30.5 cm Order a Copy

Negative by Timothy O'Sullivan. "Incidents of the War" series. Title, imprint and copyright information are printed on both sides of the mount. Image of a pontoon wagon and boat affixed. Sutlers cabin with tent roof surrounded by a log stockade in right background, along with photographers wagon.

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