1Thomas Jefferson to Alexander von Humboldt, 6 March 1809 (Jefferson Papers)
I recieved safely your letter of May 30. & with it your astronomical work & Political essay on the kingdom of New Spain , for which I return you my sincere thanks. I had before heard that this work had begun to appear, & the specimen I have recieved proves that it will not disappoint the expectations of the learned. besides making known to us one of the most singular & interesting countries on...