Based almost entirely on primary source material using period newspaper articles, census data and museum archives. In addition to Dirk van Erp, the book includes Harry St. John Dixon, D'Arcy Gaw, August Tiesselinck, William and Agatha van Erp, Lillian Palmer, Fred Brosi, Hans Jauchen, Armenac Harienian, Harry L. Dixon, Digby Brooks, Robert Mills, Ernest Burnley, and John Willocx -- from back cover.