Graham Greene's Complete Short Stories
As the title suggests, this gathers most, if not all, of Greene's short fiction in one place. For those interested in the books where these stories were first collected:
Stories 01 to 21: 1954's Twenty-One Stories (itself an expansion of 1947's Nineteen Stories)
Stories 22 to 25: 1963's A Sense of Reality
Stories 26 to 37: 1967's May We Borrow Your Husband? and Other Comedies of the Sexual Life
Stories 38 to 49: 1990's The Last Word: And Other Stories