Where can I find these letters online?

In an arrangement with our publisher, Princeton University Press, the University of Virginia Press launched an electronic, fully searchable, subscription-based edition of The Papers of Thomas Jefferson in 2009. This evolved into a shared platform with other Founding-Era papers projects on the University of Virginia Press’s Rotunda imprint.  A free, open access Founders Online model was released in beta version in June 2013 and is supported by the National Historical Publications and Records Commission (NHPRC).