http://www.icpsr.umich.edu/DDI/org/Revisions-Manual8-15-05.pdf Mary Vardigan Assistant Director Inter-university Consortium for Political and Social Research (ICPSR) University of Michigan P.O. Box 1248, Ann Arbor, MI 48106-1248 Phone: 734-615-7908 Fax: 734-647-8200 www.icpsr.umich.edu