Columbia subject headings:
Colonization--History.
Science--Economic aspects.
Science--History.
Science--Social aspects.
Harvard subject headings:
Colonization--History.
Science--Economic aspects--History.
Science--Economic aspects.
Science--History
Science--Social aspects
Science--Social aspects--History.
Princeton subject headings:
Europe--Colonies--Africa.
Science--Europe--History--19th century.
Science--History--19th century.