Columbia subject headings:
Harvard subject headings:
Atmospheric carbon dioxide.
Climatic changes--Pacific Area.
Climatic changes--West (U.S.)
Paleoclimatology--Pacific Area.
Paleoclimatology--West (U.S.)
Princeton subject headings:
Atmospheric carbon dioxide.
Climatic changes--Pacific Area.
Climatic changes--West (U.S.).
Paleoclimatology--Pacific Area.
Paleoclimatology--West (U.S.).