HAMEL, Georg. "Zur Einsteinischen Gravitationstheorie", offprint from Sitzungsberichten der Berliner Mathematischen Gesellschaft, XIX Jahrgang, 1920, pp 65-73. Fine copy. $100 Original wrappers.
Signed "Herrn Kollegen Reissner (of the Reissner-Nordstrom metric, a static solution to the Einstein-Maxwell field equations, among many other accomplishments).
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