During the Chinese Qing dynasty (1644-1911), millions of square-holed 'cash' coins were produced each year. The use of individual mint names and privy marks for sub-mints on the coins, and ever-changing economic conditions led to great variety in the coin types issued by the dynasty. The conquest of Xinjiang, and the Taiping rebellion also contributed to the variety of coins. This book is the first to deal with the coins of the dynasty as a whole, and to address many problems of chronology and attribution that have not hitherto been considered.