For all that we're no People of the Book, M. L. West's magisterial Indo-European Poetry and Myth comes as close to a one-stop-shop for pagan Received Tradition as I can think of.
I first discovered the Wonderful World of West while tracking down a purported taboo in Indo-European cultures against pissing toward the Sun.
Sure enough, in culture after culture, there it is, written not on paper but in the hearts and minds of the people: you don't piss toward the Sun.
