1Andrew Ellicott to Albert Gallatin, 27 December 1802 (Jefferson Papers)
I wish you to give me credit for the map , and observations that accompanied it , which I furnished last year.—In the construction, and delineation of the map, and drawing up the observations, I was constantly engaged more than forty days.— The map has cost me about forty dollars, which arose from the following circumstance.—When I began the work, I had to purchase a pentagraph, to reduce my...