My colleague, the curator for American and British history, just brought my attention to an interesting digital library of French correspondence in French by people living in Louisiana during from the 18th and 19th centuries. You will find 100 letters selected from the Louisiana State University's Special Collections department which can be browsed by name, gender, profession, topic, etc. Both images of the originals and transcripts are included. The project was a joint venture between LSU's Center for French and Francophone Studies (dir. Bernard Cerquiglini) and LSU Libraries.