Columbia subject headings:
Harvard subject headings:
Franklin (Sussex County, N.J.)--History.
Iron mines and mining--New Jersy--Sussex County--History.
Minerals--New Jersey--Sussex County--Classification.
Mines and mineral resources--New Jersey--Sussex County--History.
Mines and mineral resources--New Jersy--Sussex County.
Ogdensburg (N.J.)--History.
Zinc mines and mining--New Jersy--Sussex County--History.
Princeton subject headings:
Franklin (Sussex County, N.J.)--History.
Minerals--New Jersey--Sussex County--Classification.
Mines and mineral resources--New Jersey--Sussex County--History.
Ogdensburg (N.J.)--History.