books.google.com - A collection of historical research on strikes in America comprised of two types of essays, those focused on an industry or economic sector and those focused on a theme. This approach provides a detailed perspective as well broad historical and social coverage of the topic....http://books.google.com/books/about/Encyclopedia_of_Strikes_in_America.html?id=EHzk54IjNpEC&q=IWW+and+labor+contractors&utm_source=gb-gplus-shareEncyclopedia of Strikes in America
