Historical Thematic US County Maps, 1790 - 1900*

Dennis Hodgson
Department of Sociology and Anthropology
Fairfield University

 *GIS Boundary Information and Census Data were obtained from the National Historical Geographic Information System site:  http://www.nhgis.org.
National Historical Geographic Information System:
Release Version 0.9
Minneapolis: Minnesota
Population Center University of Minnesota, 2006.
NHGI staff:
John S. Adams, William C. Block, Mark Lindberg, Robert McMaster,Steven Ruggles, and Wendy Thomas.