Columbia subject headings:
Amazon River Region--Description and travel.
Ecotourism--Ecuador--Napo (Province)--Guidebooks.
Napo (Ecuador : Province)--Description and travel.
Harvard subject headings:
Amazon River Region--Description and travel.
Ecotourism--Ecuador--Napo (Province)--Guidebooks.
Napo (Ecuador : Province)--Description and travel.
Princeton subject headings:
Amazon River Region--Description and travel.
Ecotourism--Ecuador--Napo (Province)--Guidebooks.
Napo (Ecuador : Province)--Description and travel.