My husband recently surprised me with the book Lincoln and the Jews by Jonathan Sarna and Benjamin Shapell. It is a fantastic book.
Benjamin Shapell seems to have an amazing collection of Abraham Lincoln's writings and documents and has allowed Jonathan Sarna to use them in the book. What I did not know was that Mr. Shapell has his collection online accessible to all of us. It's not just the Lincoln collection, but so much more! I've only started exploring, why don't you take a look too?
Check it out at Shapell Manuscript Foundation: Explore American History Online