EHLERS, ERNETS G. THE INTERPRETATION OF GEOLOGICAL PHASE DIAGRAMS - 0 - SAN FRANCISCO-U.S.A. W. H. FREEMAN AND COMPANY 1972 - 280 pag 25 cm - 0 0 . PERTINENT DEFINITIONS-PHASE RULE/BINARY SYSTEM Subjects--Topical Terms: CIENCIAS PURAS Dewey Class. No.: 550 / E345