Columbia subject headings:
Amazon River--Description and travel.
O'Hanlon, Redmond, 1947---Travel--Amazon River.
O'Hanlon, Redmond, 1947---Travel--Orinoco River (Venezuela and Colombia)
Orinoco River (Venezuela and Colombia)--Description and travel.
Harvard subject headings:
Amazon River--Description and travel.
O'Hanlon, Redmond, 1947---Journeys--Amazon River.
O'Hanlon, Redmond, 1947---Journeys--Orinoco River (Venezuela and Colombia)
Orinoco River (Venezuela and Colombia)--Description and travel.
Princeton subject headings:
Amazon River--Description and travel.
O'Hanlon, Redmond--Travel--Amazon River.
O'Hanlon, Redmond--Travel--Orinoco River (Venezuela).
Orinoco River (Venezuela and Colombia)--Description and travel.