Notes was made in reply to a request by French diplomatic officials who wished to have a better understanding of the newly independent United States. In Notes, Jefferson goes into detail describing the physical and human geography of Virgina. There was much to write about because his definition of Virginia included present-day Virginia, the Northwest Territories, and much of everything extending from the Atlantic Coast to the Mississippi River. Everything from rivers to mountains to animals to religion to currency is detailed by Jefferson.
One can buy Notes on the State of Virginia at bookstores or one can go through chapter by chapter online. The University of Virginia features Notes on the State of Virginia for free viewing.
The book reads like a textbook; however, for anyone who is interested in learning about the historical background of early Virginia or is a fan of Jefferson it is worthy a read.