Carr, Herbert Wildon, 1857-1931. The general principle of relativity in its philosophical and historical aspect / by H. Wildon Carr. - London : Macmillan and co., limited, 1920. - x, 165 p. ; 20 cm. Includes Index Subjects--Topical Terms: Relativity (Physics) Dewey Class. No.: 530.1 / CAG 1920