I nearly have a full grid, with 4 of the first 6, all of the second 6, and a sequence of 8 letters, which isn't a word, representing the title of the source. Only one word fits 15a and a word in the clue fits the answer, but I can't parse it. As for 24a, 31a and 24d, I am currently mystified - no hints required as it is still early in the day, hoping posting provides the necessary inspiration.