Columbia subject headings:
Harvard subject headings:
Guilday, John E.
Paleontology--North America
Paleontology--Quaternary
Paleontology--United States
Vertebrates, Fossil
Vertebrates, Fossil--North America.
Vertebrates, Fossil--United States.
Princeton subject headings:
Guilday, John E.
Paleontology--North America.
Paleontology--Quaternary.
Paleontology--United States.
Vertebrates, Fossil.