[ALBERT EINSTEIN] Two translations of Einstein's works, comprising: LAWSON, Robert W. (Translator). Relativity, the Special and General Theory. London: Mathuen and Co., 1921. 8vo (188 x 120 mm). Portrait frontispiece of Einstein and numerous diagrams. (Minor offsetting.) Publisher's red cloth, gilt-stamped spine (slight waterstaining to upper cover). Fourth edition.[With:]ADAMS, Edwin Plimpton. The Meaning of Relativity, Four Lectures Delivered at Princeton University, May, 1921. London: Methuen and Co., 1922. 8vo (181 x 116 mm). Numerous diagrams. (Library stamps and associated markings.) Publisher's blue cloth, gilt-stamped spine. FIRST EDITION. Provenance: R.M. Jones Ed.D (book stamp).