What sources of vector data were used to create base maps?

Vector data for small scales are from The National Map Small-Scale Collection (formerly National Atlas), while medium to large scales are comprised of The National Map themes, to include the National Hydrography Dataset (NHD) and Geographic Names Information System (GNIS) data. Other medium to large scale vector features are from USGS edited versions of U.S. Census Bureau's TIGER/Line data for Governmental Unit Boundaries, Structures, and Transportation.