http://mathoverflow.net/questions/20314/good-books-on-theory-of-distributions
http://mathoverflow.net/questions/36890/gentle-introduction-to-distribution-theory

Three possible courses of action:

1. Do nothing.
2. Close the later as a duplicate. This would result in a closed question with 4 answers and an open question with 10 answers.
3. Merge the later into the former. This would result in a single open question with 14 answers.

I vote for merging, but I wanted to check to make sure nobody objects.

There's some overlap of answers; but D'Ancona's answer is completely new. It'd be a shame to have it wilt on a closed question. Merging sounds good to me.