1From Thomas Jefferson to Benjamin Henfrey, 3 January 1808 (Jefferson Papers)
Your letter of Dec. 1. has been recieved some days. the government is disposed to encourage the working a sulphur mine and to make the advance you desire, on proper security, and on satisfactory information as to the quality & quantity of the ore. you are therefore desired to send to the Secretary at War, by the stage which comes from the Westward of this place, samples of the different...