The books on my list appear on literally zillions of book challenges, and most are sourced from the challenges below.
30 Great Opening Lines in Literature (and similar): 1-8
Titles without the Ten Most Common Words: 29-66
An English Major's Library of Classics: 67-74
Books to Read Before You Die Compilation: 75-124
Booker Prize Winning Books (and similar): 125-132
Books Everyone Needs to Read 1962-2013: 133-138
As usual I pilfered books when I redid the above challenges over the last day or so, so as to increase my chances of having some items to check off a year from now when I re-redo the same lists. Most are on my main TBR, so effectively all I'm doing is prioritising certain books.