Google Books has made available the following books that recently went into the public domain available for free:

1. "A Farewell To Arms" by Ernest Hemingway
2. "All Quiet On The Western Front" by Erich Maria Remarque
3. "God's Man: A Novel In Woodcuts" by Lynd Ward
4. "Toad of Toal Hall" by Alan Alexander Milne

I have read and recommend #1 and #2.