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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 #: GLC09120.063 Author/Creator: Diamond, Sidney, 1922-1945 Place Written: Edgewood Arsenal, Maryland Type: Autograph letter signed Date: 6 July 1942 Pagination: 16 p. : Height: 15.5 cm, Width: 23 cm Order a Copy

Diamond discusses whether he thinks that there will be a need for chemical warfare in the war effort soon. States that he believes in the ideals of the country. Informs Estelle that he is now responsible for a squad of eight men, and describes what an attack would be like.

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