Columbia subject headings:
Agriculture--Europe.
Economics, Prehistoric--Europe.
Europe--Antiquities.
Europe--Economic conditions--To 1492.
Higgs, Eric S.
Harvard subject headings:
Agriculture--Europe.
Economics, Prehistoric--Europe.
Europe--Antiquities
Europe--Economic conditions--To 1492
Higgs, E. S. (Eric Sidney), 1908-1976
Princeton subject headings:
Agriculture--Europe.
Economics, Prehistoric--Europe.
Europe--Antiquities.
Europe--Economic conditions--To 1492.
Higgs, Eric, 1958-