Legislative Technology Services BureauThis polygon data laye represents census block groups for Walworth County, Wisconsin in 1990. The dataset was originally published by the Legislative Technology Services Bureau on March 21, 2001.[This data layer is a polygon shapefile of the 1990 U.S. Census block groups within the county, derived from the 2000 TIGER Line Files. It is referenced to the Wisconsin Transverse Mercator (WTM) projection system, North American Datum 1983 with the 1991 adjustment (NAD83/91).]Shapefileark:/77981/gmgskd1qk0bengPublicCensus Block Groups [Wisconsin--Walworth County] {1990}DatasetsWisconsin--Walworth CountyWisconsin1990American Geographical Society Library – UWM Libraries