I ordered The Hargrave Correspondence, 1821-1843 and The Letters of Letitia Hargrave from Amazon on February 8. So far the order has been delayed twice and is now scheduled for shipping May 25 (“Usually ships in 3 to 4 weeks” – usually). Elsewhere, Greenwood Publishers claims to have the books in stock (ISBN: 0-8371-5062-0 and ISBN: 0-8371-5065-5), but on a belated check of the LSU library I found both of the books in the stacks. I should have looked there in the first place.
Note that The Letters of Letitia Hargrave are available on-line and the electronic documents are searchable with a very nice interface.
-KKM