Columbia subject headings:
Harvard subject headings:
Birds, Fossil--Arizona--Mohave County.
Birds, Fossil--California--San Diego County.
Paleontology--Arizona--Mohave County.
Paleontology--California--San Diego County.
Paleontology--Miocene
Paleontology--Neogene
Paleontology--Pliocene
Princeton subject headings:
Birds, Fossil--Arizona--Mohave County.
Birds, Fossil--California--San Diego County.
Paleontology--Miocene.
Paleontology--Neogene.
Paleontology--Pliocene.