Einstein, Albert (1879-1955) Die Grundlage der allgemeinen Relativitätstheorie. Leipzig: Johann Ambrosius Barth, 1916 [Stuttgart: Druck von Omnitypie-Ges., Nachfl. L. Zechnall]. First separate edition of Einstein's Foundation of the Generalized Theory of Relativity, octavo, advertisements on verso of wrapper marked, Metzger & Wittig, Leipzig; Stuttgart imprint on verso of title; bound in publisher's printed paper wrappers, 64 pages, cover chipped with loss, title glued to outer cover, 9 1/4 x 6 in.
[Together with] Einstein's Zur Einheitlichen Feldtheorie, Berlin: Akademie der Wissenschaften by Walter de Gruyter & Co., 1929, large octavo, 8 pages, in publisher's orange paper wrappers, housed in custom box, 7 x 10 in. (2)
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