Jonathan Garlock's Guide to the Local Assemblies of the Knights of Labor makes accessible a great deal of information necessary for understanding and evaluating the history and impact of this organization. It provides information on twelve thousand local assemblies organized by the Knights of Labor between 1869 and 1896. Organized geographically by state, county, and community, the Guide provides the assigned local assembly number, dates of existence, and community population for each local. The occupations of the members are given; where known, members' race, sex, and ethnicity are provided.