Columbia subject headings:
Harvard subject headings:
Geology, Stratigraphic--Holocene--Congresses.
Geology, Stratigraphic--Pleistocene--Congresses
Geology--North America--Congresses.
Mammoths--North America--Congresses.
Paleogeography--Holocene--Congresses.
Paleogeography--North America--Congresses.
Paleogeography--Pleistocene--Congresses.
Paleontology--Holocene--Congresses.
Paleontology--North America--Congresses.
Paleontology--Pleistocene--Congresses.
Princeton subject headings:
Geology, Stratigraphic--Holocene--Congresses.
Geology, Stratigraphic--Pleistocene--Congresses.
Geology--North America--Congresses.
Mammoths--Congresses.
Mammoths--North America--Congresses.
Paleogeography--Holocene--Congresses.
Paleogeography--North America--Congresses.
Paleogeography--Pleistocene--Congresses.
Paleontology--Holocene--Congresses.
Paleontology--North America--Congresses.
Paleontology--Pleistocene--Congresses.