The Christmas Book
edited by Francis X. Weiser
"The story of the celebration of Christmas, the growth of its many customs through the ages to present day American festivities."
I found this at an antique store a few years ago for $3.
Weiser was a Jesuit priest born in Austria. He dedicates the book to "the memory of a cherished friend: Georg Von Trapp, 1880-1947."
(Von Trapp is better known as the captain father in The Sound of Music.)