"A very important work." 
--Anonymous

Einstein, Albert. "Die Grundlage der allgemeinen Relativitatstheorie," pp. 769-822 in Annalen der Physik, Vierte Folge, Band 49, Heft 7, 1916.  Leipzig: Johann Ambrosius Barth, 1916.  Octavo, modern three-quarter morocco with original wrappers bound in. $5600. 

First printing, offprint issue, of Einstein's General Theory of Relativity.  "The theory's impact upon twentieth-century science and thought can hardly be overstated" (Norman 625).

Einstein's General Theory of Relativity is a continuation and dramatic expansion of some of the ground-breaking ideas set forth in his 1905 paper on special relativity. Specifically, with general relativity, Einstein applied his revolutionary conceptions of time, space, and matter to all of the universe, and providing, for the first time the definitive reinterpretation of the Newtonian model. First printing of the offprint, with "Druck von Metzger & Wittig in Leipzig" on the verso of the title and "Metzger & Wittig" centered on bottom of rear wrapper. Fine condition.