Columbia subject headings:
Harvard subject headings:
Hay Hollow Site (Ariz.)
Paleoecology--Arizona--Hay Hollow Site.
Paleoecology--Arizona.
Palynology--Arizona--Hay Hollow Site.
Palynology--Arizona.
Princeton subject headings:
Hay Hollow site, Ariz.
Paleoecology--Arizona--Hay Hollow site.
Palynology--Arizona--Hay Hollow site.