London, The Folio Society, 2004 (first thus).
Octavo, xxii, 201 pages plus numerous diagrams and formulae plus a frontispiece portrait.
Decorated papered boards; a fine copy in the slightly scuffed slipcase.
Authorised translation by Robert W. Lawson; introduction by Roger Penrose. This edition follows the enlarged fifteenth edition published by Methuen in 1954, with minor emendations.