Columbia subject headings:
Harvard subject headings:
Mammals, Fossil--Pictorial works.
Paleontology--Pictorial works.
Peabody Museum of Natural History.
Zallinger, Rudolph F. Age of mammals.
Princeton subject headings:
Mammals, Fossil--Pictorial works.
Paleontology--Pictorial works.
Peabody Museum of Natural History.
Zallinger, Rudolph F. Age of mammals.