3D Stereo Book NAZI Grenzgau Saarpfalz (Work and Cheerfulness) Arbeit und Forhsinn by Heinrich Hoffmann-This was a 1937 Christmas present. 64 pages with 24 black and white photos affixed to black pages, the 75 remaining photo cards (measuring 5" x 2-2/7") are included in the die cut storage slots inside of this red linen covered hardcover book. All photo cards are intact, as is the viewer. This book was published in 1937. A great collectable piece; complete, and in a very nice condition for its age; over 80 years old. Excellent condition!