Columbia subject headings:
Harvard subject headings:
Climatic changes--Social aspects--Europe--History--To 1500.
Human ecology--Europe--History--To 1500.
Social change--Europe--History--To 1500.
Princeton subject headings:
Climatic changes--Social aspects--Europe--History--To 1500.
Human ecology--Europe--History--To 1500.
Social change--Europe--History--To 1500.