Columbia subject headings:
Conrey Placer Mining Company--History.
Gold dredging--Montana--Alder--History.
Gold industry--Montana--Alder--History.
Harvard subject headings:
Conrey Placer Mining Company--History.
Gold dredging--Montana--Alder--History.
Gold industry--Montana--Alder--History.
Princeton subject headings:
Conrey Placer Mining Company--History.
Gold dredging--Montana--Alder--History.
Gold industry--Montana--Alder--History.