This list includes all of the books from the six most popular books lists on List Challenges. I removed duplicates (hopefully).
1) BBC Believes You've Only Read 6 of These Books...
2) 1000 Books You May Have Actually Read
3) 300 Books Everyone Should Read at Least Once
4) Amazon's 100 Books to Read in a Lifetime
5) 50 Books to Read Before You Die
6) Books You'll Never Brag About Having Read