ZSR's Special Collection and Archives may contain useful materials on your topic. There are a variety of ways to search these materials, depending on their format. The SCA website contains more information about hours and research help.
1. Search SCA materials (including books) in the library catalog. These include rare books from Britain and Ireland going back to the 18th century, such as travel narratives and papers from various figures in British history.
2. Search SCA finding aids to locate materials in collections that are not digitized. (Visit the Special Collections and Archives room in ZSR 625 for help using finding aids!)