Gmelins Handbuch der Anorganischen Chemie . Systematik der Sachverhalte , 1957, $17.28; system No. 28: Calcium , pt. B, sec. 2, 1957, xvi + 391 pp., illus., $52.56; system No. 60: Kupfer , pt. B, sec. 1, 1958, xxvii + 624 pp., illus., $83.76. Verlag Chemie, Weinheim/Bergstrasse, Germany.