Cameron, I. B. Sources of aggregate in Northern Ireland / I. B. Cameron. - London: Her Majesty's Stationery Office, 1970. - iv, 29 p. : tables ; 30 cm. - Institute of Geological Sciences : Natural Environment Research Council. 70/5 . Includes bibliographical references (p. 29). ISBN: 0118801171 Subjects--Topical Terms: SourcesSources--Northern Ireland Dewey Class. No.: 628.114161