530.11 Lor P Loentz, Hendrik Antoon, 1853-1928 The principle of relativity. A collection of original nenoirs on. the special and general theory of relativity, by H. A Lorentz [and others] with notes by A. Sonmerfeld. Tr. by W. Perrett and G. B. Jeffery, London, Constable [1923] 216 p. ilun. 21 cn