1From Thomas Jefferson to Antonia Reynon Carmichael, 30 May 1797 (Jefferson Papers)
I am to return you my thanks for the copy of the memoire you have been so good as to send me. It contains just and interesting observations on the importance of a navigation through the isthmus of Darien . The late Mr. Carmichael had hoped he could procure for us the copy of a survey of that isthmus said to exist in the archives of the Spanish government. But I imagine it is too carefully...