The author and publishers wish to express their thanks to the below sources of illustrative material and/or permission to reproduce it.
Copyright © the author: pp. 20, 22, 23, 25, 26, 36, 38 43, 45, 55, 63, 76, 78, 79, 88, 90, 101, 105, 108, 109, 115, 125, 148, 152, 154, 155, 162, 180, 181, 203, 217; © The Trustees of the British Museum, London: p. 10; from Indian Railways Handbook (1935): p. 179; from Mongolian Architecture (Ulaanbaatar, 1988): p. 65; copyright Musée National des Châteaux de Versailles et de Trianon, Paris: p. 135.