Koht, Halvdan, 1873-1965 Driving forces in history : drivmakter i historia, Oslo, 1959 / Halvdan Koht ; translated from the Norwegian by Einar Haugen - Cambridge, Mass.: Belknap Press of Harvard University Press, 1964 - x, 217 p. : 22 cm. LCCN: 64-16065 Subjects--Topical Terms: History--Philosophy