Published by Walter de Gruyter & Co, Berlin, 1943
Seller: Kubik Fine Books Ltd., ABAA, Dayton, OH, U.S.A.
Hardcover. Condition: Very good. 10th edition. 271p. A blue hardcover book in very good condition. The spine is tanned and has some light wear at the top and along the side, bordering the front cover. All pages tanned with age, but text clean and binding tight. A vintage book of math puzzles, with text in German.