1William Dawson to Samuel Greenhow, 24 May 1809 (Jefferson Papers)
Greenhow, Samuel; letters from W. Dawson to [index entry]
2Samuel Greenhow to Thomas Jefferson, 29 May 1809 (Jefferson Papers)
Greenhow, Samuel; letters from W. Dawson to [index entry]
3William Dawson to Samuel Greenhow, 1 July 1809 (Jefferson Papers)
Greenhow, Samuel; letters from W. Dawson to [index entry]