Coolidge, J.L. "The Number e" in The American Mathematical Monthly, volume 57, number 9, November 1950. Coolidge's article occupies pp 591-602 of the issue (which comprises pp 591-662. Excellent short summary of the history and innards of the number e by the superb Julian Lowell Coolidge, long-time chair of Harvard math. Original printed wrappers. Very good condition. Nice fresh copy. $40
Other works by Cooliedge:
J. L. Coolidge (1924) The geometry of the complex domain, The Clarendon Press.
J. L. Coolidge (1925) An introduction to mathematical probability, Oxford University Press.
J. L. Coolidge (1945) History of the conic sections and quadric surfaces, The Clarendon Press.