Columbia subject headings:
Public works--Equatorial Guinea.
Public works--Río de Oro.
Spain--Colonies--Africa, West.
Harvard subject headings:
Equatorial Guinea--Public works.
Public works--Equatorial Guinea.
Public works--Río de Oro.
Río de Oro--Public works.
Spain--Colonies--Africa, West.
Princeton subject headings:
Equatorial Guinea--Public works.
Río de Oro--Public works.
Spain--Colonies--Africa, West.