Winkler Helmut G F Petrogenesis of metamorphic rocks Winkler Helmut G F - 4 - New Delhi Narosa Publishing House 1976 - 334p. cm. Index 331-334p. Standard No.: 14804 Source: Textual Subjects--Topical Terms: Metamorphic rocks PetrogenesisGeology Dewey Class. No.: H22:16, L4;L6;1