There's a very quick YouTube video where The Morgan Library's assistant curator, Clara Drummond, shows you one of Jane Austen's letters. It's a wonderful insight into how Jane Austen would use every available millimeter of paper to scribble her thoughts, accounts of events, and desires for fashionable items.
Mind, she would frequently use every bit of paper to also write absolutely terrible - but very witty! - things about the arrival of new babies in the family and among acquaintances. One sample:
"I give you joy of our new nephew, and hope if he ever comes to be hanged it will not be till we are too old to care about it."(April 25, 1811)