EINSTEIN, ALBERT und W. MAYER.

Einheitliche Theorie von Gravitation und Elektricität.

Berlin, Gruyter & Co., 1931.

4to. Orig. printed orange wrapper. Offprint/Sonderausgabe aus Sitzungsberichten..pp. (1)-19. Fine fresh copy.

First edition in the rare Offprint with separate printed title and separate pagination. Se Weil No. 182 where this is not mentioned. Weil No. 182 with an asterix, denoting a major work.
The early Offprints from "Sitzungsberichten..." are called "Sonderabdruck" up to Weil No.165 (including this). From Weil 166 they are called "Sonderausgabe...". - Before 161 (up to 160) the Offprints do not have separate title and pagination (the pagination follows the numbering in the periodical). From 166 the Offprint has both separate printed title and pagination. - ( So Weil Nos 161-165 is still "Abdruck", but with separate title and pagination). These facts are not mentioned in the bibliographies.

Order-nr.: 28370