Its Rural Economy, Population, and Produce, Particularly in the County of Modica : with an Appendix, Containing Observations on Its General Character, Climate, Commerce, Resources, &c. : from a Late Survey of the Abbate Balsamo ... : to which are Added, with Notes Throughout the Work, an Examination of the Sicilian Volunteer System, and Extracts from Letters Written in Sicily in 1809 and 1810