Columbia subject headings:
Census--Data processing--History.
Hollerith, Herman, 1860-1929--Anniversaries, etc.
Punched card systems--History.
United States. Bureau of the Census--Anniversaries, etc.
Harvard subject headings:
Princeton subject headings:
Census--Data processing--History.
Hollerith, Herman--Anniversaries, etc.
Punched card systems--History.
United States. Bureau of the Census--Anniversaries, etc.