Time Magazine provides their list. I'm sure this list will be much debated, but I mean really, omitting Absalom, Absalom! You have to be kidding me. And why on earth did they choose 1923 as the starting point? Just to exclude Ulysses (1922)?
Even with the gnashing of teeth here, I've managed to read over a third of these (3538). Admittedly, most of them were for school--a by product of a master's degree in English.