The Foundations of Einstein's Theory of Gravitation. FREUNDLICH, Erwin. [EINSTEIN, Albert] Published by Cambridge University Press. 1920. First English Edition, First print. Translated from the original German by the Australian physicist Henry Brose. The first English edition, a slim 60-page pamphlet published in 1920. Extreme Rare. Erwin Freundlich (1885-1964) was a renowned astronomer and close working associate of Albert Einstein. In this volume Freundlich provides a concise explanation of the ideas and theories which led to the general theory of relativity Condition: With a preface by Albert Einstein Hardcover on green cloth with gilt title on spine in very good condition. Ex. library copy with minimal stamps. Clean interior, binding tight. 60 pages, dimension: 21.5 x 14.5 cm. Please view & used the photos for further details! Shipped tracked and insured.