Baltimore County GovernmentFeature class contains all contour lines for Baltimore County.ArcGIS DynamicMapLayerhttps://hub.arcgis.com/datasets/9b7ab1419adc49de8691af9b4fa49b6c_3engBaltimore County Open Data PortalPublicContours 2005 [Maryland--Baltimore County]Web servicesMaryland--Baltimore CountyMaryland2005