Columbia subject headings:
Cartography--United States--Data processing.
Digital mapping--United States.
Geographic information systems--United States.
Information policy--United States.
Harvard subject headings:
Cartography--United States--Data processing.
Digital mapping--United States.
Digital mapping.
Geographic information systems--United States
Information policy--United States
Princeton subject headings:
Cartography--United States--Data processing.
Digital mapping--United States.
Geographic information systems--United States.
Information policy--United States.