Columbia subject headings:
John Martin Reservoir (Colo.)
Harvard subject headings:
Archaeological surveying--Colorado--John Martin Reservoir Region.
Bent County (Colo.)--Antiquities--Surveys.
Colorado--Antiquities.
Historic sites--Colorado--John Martin Reservoir Region.
Indians of North America--Colorado--John Martin Reservoir Region--Antiquities.
John Martin Reservoir Region (Colo.)--Antiquities--Surveys.
Princeton subject headings: