Hydrologic units : Essex County, [Virginia] (057) / prepared by Virginia Department of Conservation and Recreation, Division of Soil and Water Conservation ; prepared for USDA Natural Resources Conservation Service, Virginia Department of Conservation and Recreation, Virginia Department of Environmental Quality.
Edition
Rev. January 1995.
Published
Ft. Worth, TX : USDA-NRCS-National Cartographic and GIS Center ; Richmond, Va. : The Division [distributor, 1995]