11Alden Partridge to Thomas Jefferson, 9 January 1818 (Jefferson Papers)
altitude; barometers used to calculate [index entry]
12Enclosure: Alden Partridge’s Notes on Altitudes of Mountains, 20 August 1817 (Jefferson Papers)
altitude; barometers used to calculate [index entry]
13Alden Partridge to Thomas Jefferson, 20 February 1818 (Jefferson Papers)
altitude; barometers used to calculate [index entry]
14George Wyche to Thomas Jefferson, 28 October 1818 (Jefferson Papers)
altitude; barometers used to calculate [index entry]