1William Lambert to Thomas Jefferson, 14 November 1811 (Jefferson Papers)
Washington (D.C.); longitude of [index entry]
2William Lambert to Thomas Jefferson, 22 November 1811 (Jefferson Papers)
Washington (D.C.); longitude of [index entry]
3William Lambert to Thomas Jefferson, 23 April 1812 (Jefferson Papers)
Washington (D.C.); longitude of [index entry]