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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.

Diamond, Sidney, 1922-1945 to Estelle Spero

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Gilder Lehrman Collection #: GLC09120.070 Author/Creator: Diamond, Sidney, 1922-1945 Place Written: Edgewood Arsenal, Maryland Type: Autograph letter signed Date: 14 July 1942 Pagination: 6 p. : Height: 15.5 cm, Width: 23 cm Order a Copy

Diamond outlines the day's course of events, which included watching two films - one on "Booby traps" and one on signal communication, instructing a group on map-reading and map-making,

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