Harvey Pekar and illustrated by Ed Piskor among others. Okay so this hasn't been in the "vaults" per se, as it was published in 2009; but it leapt out at me from the 810's where it is shelved. 810.9 P379 to be exact.
I just wanted to point it out because there are three copies just languishing on the shelves. Two in POP and one in LIT. Here is a review if you need some inspiration.