Columbia subject headings:
Pumping machinery industry--United States--History--20th century.
Warren Rupp Company--History--20th century.
Harvard subject headings:
Pumping machinery industry--United States--History--20th century.
Warren Rupp Company--History--20th century.
Princeton subject headings:
Pumping machinery industry--United States--History--20th century.
Warren Rupp Company--History--20th century.