On American folklore

I admit my ignorance on American folklore. Neil Gaiman's American Gods is an amazing attempt to answer to some mythological questions, but strictly speaking it doesn't really touch folklore. Since I have no serious knowledge on local lore, I checked out this book:

Lurking at the library

While browsing the books at a local library I found a whole section on folklore, monster theory and horror... I could not help but check some of the titles.