Columbia subject headings:
Colorado River (Colo.-Mexico)--Description and travel.
Colorado River (Colo.-Mexico)--History.
Colorado River Valley (Colo.-Mexico)--Description and travel.
Colorado River Valley (Colo.-Mexico)--History.
Fradkin, Philip L.
Harvard subject headings:
Colorado River (Colo.-Mexico)--Description and travel.
Colorado River (Colo.-Mexico)--History.
Colorado River Valley (Colo.-Mexico)--Description and travel.
Colorado River Valley (Colo.-Mexico)--History.
Fradkin, Philip L.
Princeton subject headings:
Colorado River (Colo.-Mexico)--Description and travel.
Colorado River (Colo.-Mexico)--History.
Colorado River Valley (Colo.-Mexico)--Description and travel.
Colorado River Valley (Colo.-Mexico)--History.
Fradkin, Philip L.