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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 Co. 'D', U.S. Engineers Camp in Front of Petersburg, Va. September 1864.

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Gilder Lehrman Collection #: GLC05111.01.0256 Author/Creator: O'Sullivan, Timothy Place Written: Petersburg, Virginia Type: Photograph Date: 1864/09 Pagination: 1 photograph ; 38.7 x 26.7 cm Order a Copy

Negative by Timothy O'Sullivan. Positive by A. Gardner. "Incidents of the War" series. A whole in the negative in the upper left corner shows in the image. Co. D, U.S. Engineers posed in four rows with canopy of pine branches and tents behind. The two men sitting on the far right exchange a piece of hardtack.

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