Columbia subject headings:
Harvard subject headings:
Portugal--Description and travel.
Portugal--Economic conditions--1918--Case studies.
Portugal--Economic conditions--1918-1974--Case studies.
Spain--Description and travel.
Spain--Economic conditions--1918---Case studies.
Spain--Economic conditions--1918-1975--Case studies.
Princeton subject headings:
Portugal--Description and travel.
Portugal--Economic conditions--1918--Case studies.
Spain--Description and travel.
Spain--Economic conditions--1918---Case studies.