An exposure of the spy system pursued in Glasgow, during the years 1816-17-18-19 and 20 : with copies of the original letters, &c. &c. &c. of Andrew Hardie, who was executed for high treason at Stirling, in September, 1820 / - Mackenzie, Peter, (Printed and published by Muir, Gowans, & Co.,, 1832)