1Thomas Jefferson to Gideon Fitz, 23 May 1809 (Jefferson Papers)
Briggs, Isaac; surveyor of federal lands [index entry]
2Thomas Jefferson to Albert Gallatin, 4 November 1809 (Jefferson Papers)
Briggs, Isaac; surveyor of federal lands [index entry]
3Thomas Jefferson to Albert Gallatin, 3 February 1812 (Jefferson Papers)
Briggs, Isaac; surveyor of federal lands [index entry]
4Thomas Jefferson to Albert Gallatin, 9 November 1812 (Jefferson Papers)
Briggs, Isaac; surveyor of federal lands [index entry]
5Isaac Briggs to Thomas Jefferson, 16 February 1816 (Jefferson Papers)
Briggs, Isaac; surveyor of federal lands [index entry]
6Alexander J. Dallas to Thomas Jefferson, 16 February 1816 (Jefferson Papers)
Briggs, Isaac; surveyor of federal lands [index entry]
7Thomas Jefferson to Alexander J. Dallas, 26 February 1816 (Jefferson Papers)
Briggs, Isaac; surveyor of federal lands [index entry]
8Thomas Jefferson to Isaac Briggs, 27 February 1816 (Jefferson Papers)
Briggs, Isaac; surveyor of federal lands [index entry]
9Thomas Jefferson to Wilson Cary Nicholas, 2 April 1816 (Jefferson Papers)
Briggs, Isaac; surveyor of federal lands [index entry]
10Isaac Briggs to Thomas Jefferson, 7 May 1816, with Postscript by Mary B. Briggs (Jefferson Papers)
Briggs, Isaac; surveyor of federal lands [index entry]
11Thomas Jefferson to Isaac Briggs, 18 May 1817 (Jefferson Papers)
Briggs, Isaac; surveyor of federal lands [index entry]