Hallesby, Ole, 1879-1961. Prayer / by O. Hallesby ; translated by Clarence J. Carlsen. - 31st ed. - Minneapolis, Minn. : Augsburg Pub. House, 1939, c1931. - 176 p. ; 21 cm. Subjects--Topical Terms: Prayer. Dewey Class. No.: 248 / H185P