Columbia subject headings:
Harvard subject headings:
Climatic changes--Social aspects--Canada.
Climatic changes--Social aspects--United States.
Human beings--Effect of climate on--Canada.
Human beings--Effect of climate on--United States.
Indians of North America--Canada.
Indians of North America.
Princeton subject headings:
Climatic changes--Social aspects--Canada.
Climatic changes--Social aspects--United States.
Human beings--Effect of climate on--Canada.
Human beings--Effect of climate on--United States.
Indians of North America.