Ore, Oystein 1899-1968. Number theory and its history. - 1st ed. - New York: McGraw-Hill Book Co., 1948. - x, 370 p.: illus.; 21 cm. Includes bibliographies. LCCN: 48008825 //r90 Subjects--Topical Terms: Number theory.Mathematics---History. Dewey Class. No.: 512.81 / O66n