For your consideration is this Glacier National Park and Yellowstone National Park postcard books, circa 1930s - 1940s, though the oldest is Post Office stamped 1922!. There are sixteen (16) postcard books in this collection: seven (7) of them are "Haynes Souvenir Folder" postcards from Yellowstone, one of which was postmarked in 1922; nine (9) Glacier postcard books, three (3) postmarked 1934, 1943, and 1955. Some of the collection have personal messages, many have plastic protection sleeves most likely from a retailer. The condition of these postcards is good, with some wear from age. The measurements of these postcard books are 4.25"W x 6.25"L.