Our Collection

At the Institute’s core is the Gilder Lehrman Collection, one of the great archives in American history. More than 70,000 items cover five hundred years of American history, from Columbus’s 1493 letter describing the New World to soldiers’ letters from World War II and Vietnam. Explore primary sources, visit exhibitions in person or online, or bring your class on a field trip.

Knox, Henry (1750-1806) to Richard Platt

High-resolution images are available to schools and libraries via subscription to American History, 1493-1943. Check to see if your school or library already has a subscription. Or click here for more information. You may also order a pdf of the image from us here.

Gilder Lehrman Collection #: GLC02531 Author/Creator: Knox, Henry (1750-1806) Place Written: New Windsor Type: Autograph letter signed Date: 18 March 1781 Pagination: 2 p. : docket ; 24.5 x 19.6 cm.

Discusses the preliminary drawings of an artillery building at West Point which will include an ordnance store and a crane projecting from the building's pediment. Knox requests another building to serve as a laboratory.

Platt was a Colonel in the Continental Army from 1775-1783, was Aide de camp to General Montgomery and a charter member of Society of Cincinnati.

Order a CopyCitation Guidelines for Online Resources