DIRAC, P[aul A. M.] The principles of quantum mechanics. Oxford: The Clarendon Press, 1930. 8vo. x, 257,  pp. FIRST EDITION. Original cloth, author and title in gilt on spine; an excellent copy. Item #19283 Price: $6,500.00 Add to Cart Ask a Question See all items in Science See all items by DIRAC, aul A. M.