Columbia subject headings:
Harvard subject headings:
Businessmen--United States--Biography
Businesspeople--United States--Biography.
Mineral industries--United States--History.
Pardee, Calvin, 1841-1923.
Purdy family.
Princeton subject headings:
Businessmen--United States--Biography.
Mineral industries--United States--History.
Pardee, Calvin, 1841-1923.
Purdy family.