Editore: Verlage des Observatoriums, Potsdam
Da: White Raven Books, Ypsilanti, MI, U.S.A.
Soft cover. Condizione: Very Good. This set published 1922, 1924, 1925, & 1926, bound together with peach wraps; 1/2 oliver leather & green cloth over boards, gilt spine title, & decorative pastedown/endpapers; A very good ex library copy; 30, 31, 79, 20, 48, & 19 pages. Size: 9.25"x12.5".