During the 1930s, Toronto-born, Peel-raised lawyer William Perkins Bull decided to write about the history of the County of Peel. Assembling a staff that peaked at around 100 people, he published 13 books, including ten on Peel's natural and human history. Bull was particularly interested in the early settler families of Peel and sent surveys to hundreds, perhaps thousands of families around the county, asking questions about their family history. These surveys and/or other material such as clippings from newspapers, archival and land records research, and oral histories were assembled into files by surname. These family files survive at the Region of Peel Archives, part of the Peel Art Gallery, Museum and Archives (PAMA).