1From Thomas Jefferson to Benjamin Smith Barton, 27 December 1803 (Jefferson Papers)
Some propositions having been made to the public on the subject of a natural bed of Sulphur in Genesee, we wished to obtain information respecting it. Capt Williamson tells me you passed some time in examining it, and I am sure therefore you can give me better information respecting it than any other person, & on which I shall more rely. I pray you therefore to do it without delay, as we are...