EINSTEIN, ALBERT. Die Grundlage der allgemeinen Relativittstheorie. Leipzig: Johann Ambrosius Barth, 1916. 8vo, original printed wrappers, uncut, spine defective and with tape repairs, chipping to edges; light marginal chipping and browning, owner's ink stamp on title. First separate printing. Offprint from Annalen der Physik, Volume 49, no. 7. Weil 80a.