1Thomas Jefferson to Isham Lewis, 1 May 1809 (Jefferson Papers)
Fitz, Gideon; surveying work of [index entry]
2Thomas Jefferson to Albert Gallatin, 4 November 1809 (Jefferson Papers)
Fitz, Gideon; surveying work of [index entry]
3Thomas Jefferson to Albert Gallatin, 9 November 1812 (Jefferson Papers)
Fitz, Gideon; surveying work of [index entry]