Die Kompatibilität der Feldgleichungen in der einheitlichen Feldtheorie.

Berlin, Gruyter X Co., 1930. 4to. Orig. orange printed wrappers. Offprint/Sonderausgabe aus Sitzungsberichten... pp. (1)-13.

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First edition in the rare Offprint, having separate printed title and separate pagination. See Weil No. 170, where this is not mentioned.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.