While there are many different aspects to this collaboration, the main collaborators have been UC DATA and The UC Berkeley Library . We are extremely grateful to the Oregon State University Government Information Sharing Project for their generosity in sharing knowledge and time with us. Software for the 1990 Census LOOKUP was developed by Lawrence Berkeley National Laboratory. We would also like to acknowledge the cooperation of the U.S. Census Bureau for allowing us to access their data for STF1 and STF3.