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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.

Seuss, John L., fl. 1863 [Diagram of an arch]

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Gilder Lehrman Collection #: GLC06166.03 Author/Creator: Seuss, John L., fl. 1863 Place Written: s.l. Type: Manuscript document Date: 1863 Pagination: 1 p. : Height: 10.8 cm, Width: 22.5 cm Order a Copy

Diagram of the proper usage of an arch in internal construction.

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