Columbia subject headings:
Harvard subject headings:
Archaeological surveying--Texas--Presidio County.
Polvo Site (Tex.)
Presidio County (Tex.)--Antiquities.
Princeton subject headings:
Excavations (Archaeology)--Texas--Presidio County.
Indians of North America--Texas--Presidio County--Antiquities.
Presidio County (Tex.)--Antiquities.
Texas--Antiquities.