Davidson, Martin. Elements of mathematical astronomy, with a brief exposition of relat ivity/ Martin Davidson. Revised by Cameron Dinwoodie - [3rd ed.] - London: Hutchinson Scientific and Technical Publications, [196 2] - 276 p.: ill.; 22 cm Includes bibliographical references Subjects--Topical Terms: Astronomy--------Relativity (Physics)-------- Dewey Class. No.: 520 DAV