Ridge, John Drew, 1909- Ridge, John Drew, 1909- Selected bibliographies of hydrothermal and magnetic mineral deposits. - [New York] : Geological Society of America, [1961] - The Geological Society of America. Memoir ; 75 . - Memoir (Geological Society of America) ; 75 . Subjects--Topical Terms: Geology, Economic -- Bibliography.--Geology, Economic -- Bibliography.Ore deposits -- Bibliography.--Ore deposits -- Bibliography.