Atlas Folio, by the National Geographic Society (VERY oversized, HC, 1958, $10, which is 1/3 the internet price.)
This is an interesting format. It would seem that you first got the book and instructions on how to insert the maps. Then later you got the maps to glue in. The Folio is nearly complete. The only actual missing maps are of the two oceans. There are 5 additional maps. (8 pages are missing, but were intentionally left blank to insert other maps if you wanted.) All together there are 55 maps, nicely installed.
Atlas of North America: Space Age Portrait of a Continent, by National Geographic Society (VERY oversized, SC with (?) imitation leather, 1985, $7, which is 1/3 the internet price.)
I love this atlas. It includes a lot of satellite photos, and lots of other information other than just maps. Bright colors, very cool!
As these are both huge, I am going to put them atop of the glass case at least for the time being. (They would get wrecked if put anywhere else.)