I have the following:
"Starlight Nights" by Leslie Peltier a "must read" by ALL amateur astronomers.
"Lowell And Mars" by William Graves Hoyt an excellent book on Percival Lowell.
"Edmund Halley" by Alan Cook a massive book on the life and times of Edmund Halley.
"Carl Sagan a Life" by Keay Davidson, one of two biographiess on Carl Sagan.
"Clyde Tombaugh Discoverer of Planet Pluto" by David Levy. You'll learn alot about Clyde Tombaugh with this book. Also its signed by both David Levy and Clyde Tombaugh.
"Galileo's Daughter" by Dava Sobel, an excellent book that puts a new perspective on Galileo. Signed by the author.
"Edwin Hubble Mariner of the Nebula" by Gale E. Christianson, I literally just picked this book up last evening from a used book store.