The Rogers-Roche papers contain numerous letters written by Robert Rogers.
The Thomas Gage papers and Jeffrey Amherst papers contain many references to Robert Rogers.
The Thomas Gage papers also contain a letter from Gage to Jonathan Carver, dated May 2, 1768 (American Series).
The British Library has Carver's manuscript journals of his travels around North America.
The William Salt Library of the Staffordshire and Stoke-on-Trent Archive Service has a set of Richard Whitworth papers concerning financial, legal, and personal topics.
Carver, Jonathan, and John Coakley Lettsom. Three Years' Travels Through the Interior Parts of North-America.... Philadelphia: Printed and sold by Joseph Crukshank, in Market-Street, and Robert Bell, in Third-Street, 1784.
Carver, Jonathan, and John Parker. The Journals of Jonathan Carver And Related Documents, 1766-1770. Bicentennial ed. St. Paul: Minnesota Historical Society Press, 1976.
Parker, John. "Carver, Jonathan." In American National Biography Online. Accessed January 12, 2011.
Russell, Henry. "Rogers, Robert." In National Biography Online. Accessed January 12, 2011.