One of the most important books ever written on the works by M.C. Escher is this SYMMETRY ASPECTS OF M.C. ESCHER'S PERIODIC DRAWINGS by Caroline H. MacGillavry. Book is published by Bohn , Scheltem an Holkema for the International Union of Crystallography in 1976. Book measures 10.4 x 8.1 inches, contains 84 pages with text in english, Book is in Mint condition, hard cover linnen bound and dustcover is in VG++ condition.