Columbia subject headings:
Apportionment (Election law)--United States.
Apportionment--Data processing.
Election districts--United States.
Harvard subject headings:
Apportionment (Election law)--United States.
Apportionment--Data processing.
Election districts--United States.
Princeton subject headings:
Apportionment (Election law)--United States.
Apportionment--Data processing.
Election districts--United States.