This edition of Jane Austen's letters was edited by Fanny Knight's son Edward Hugessen Knatchbull-Hugessen (the first Baron Brabourne, lived 1829-1893), and was published in 1884. It's neither complete (about two thirds of the letters now known to have survived are included), nor are the texts of the letters necessarily always transcribed with minute scholarly fidelity, but it's out of copyright, and includes many annotations and quaint comments on the letters. (The latest edition of Jane Austen's letters came out in 1995.)