1Thomas Jefferson to Ferdinand R. Hassler, 25 December 1819 (Jefferson Papers)
I have duly recieved your favor of the 10 th tendering us the benefit of your acknoleged talents...
2From Thomas Jefferson to Ferdinand Rudolph Hassler, 22 June 1824 (Jefferson Papers)
Your favor of the 14 th has been duly recieved. the Visitors of the University, at their meeting...
3From Thomas Jefferson to Ferdinand Rudolph Hassler, 3 December 1825 (Jefferson Papers)
Your favor of Nov. 24. is just now recieved, with the papers on the survey of the coast which you...
4From Thomas Jefferson to Ferdinand Rudolph Hassler, 5 May 1826 (Jefferson Papers)
Your favor on the subject of the mathematical volume you propose to publish is just now recieved....
5James Madison to Ferdinand R. Hassler, 6 March 1828 (Madison Papers)
J. M. presents his respects to Mr. Hassler with many thanks for the "Popular Exposition of the...
6James Madison to Ferdinand R. Hassler, 01 September 1828 (Madison Papers)
I have recd. Sir, your letter of Aug. 31st with the 2 Copies of your "Elements of Analytic...
7James Madison to Ferdinand R. Hassler, 25 September 1828 (Madison Papers)
Your letter of the 8th. with two copies of your "Elements of Geometry" came to hand when a spell...
8James Madison to Ferdinand R. Hassler, 24 June 1830 (Madison Papers)
I have recd. with yr. letter of the 14. 2 Copies of yr. Logarithmic & Trigonometric Tables, and...
9James Madison to Ferdinand Rudolph Hassler, 22 February 1833 (Madison Papers)
I have recd. your favor with the accompanying Copies of your Report on Weights & Measures, & I...
10James Madison to Ferdinand R. Hassler, 11 February 1835 (Madison Papers)
I have received your communication relating to the survey of the coast and thank you for it....