SIGNED AND DATED BY EINSTEIN IN THE YEAR OF PUBLICATION, SCARCE 1950 EDITION OF MEANING OF RELATIVITY, 1950, WITH THE FIRST PUBLICATION OF HIS NEW GENERALIZED THEORY OF GRAVITATION, HAILED ON PUBLICATION AS “A MASTER KEY TO UNIVERSE” (NEW YORK TIMES)
EINSTEIN, Albert. The Meaning of Relativity. Princeton, 1950.
Third edition, containing the first publication of Einstein's new Generalized Theory of Gravitation (Appendix II), with substantial revisions to his quest for a unified theory that were viewed on publication as ranking "with the original appearance of the theory of relativity as a milestone of scientific achievement" (New York Times), an exceedingly scarce copy signed and dated by Einstein in the year of publication, "A. Einstein. 50." An exceptionally fine copy. $19,500.