Our Collection

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.

Private signals

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Gilder Lehrman Collection #: GLC00722.06 Author/Creator: Place Written: s.l. Type: Manuscript document Date: 1857 Pagination: 3 p. : Height: 25 cm, Width: 20 cm Order a Copy

Explains a system of secret signals to be used in communication between ships. Orders captains to memorize the formula for the protocol and then destroy the document.

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