Columbia subject headings:
Gold mines and mining--West (U.S.)--Guidebooks.
Northwest, Pacific--Guidebooks.
Northwest, Pacific--History.
Overland journeys to the Pacific.
Silver mines and mining--West (U.S.)--Guidebooks.
West (U.S.)--Guidebooks.
Harvard subject headings:
Gold mines and mining--West (U.S.)--Guidebooks.
Mines and mineral resources--Rocky Mountains Region.
Northwest, Pacific--Guidebooks.
Northwest, Pacific--History.
Overland journeys to the Pacific.
Silver mines and mining--West (U.S.)--Guidebooks.
West (U.S.)--Guidebooks.
Princeton subject headings:
Northwest, Pacific.