Columbia subject headings:
Natural history--Peru--Congresses.
Natural history--Spain--Congresses.
Peru--Civilization--Congresses.
Spain--Civilization--Congresses.
Harvard subject headings:
Natural history--Peru--Congresses.
Natural history--Spain--Congresses.
Peru--Civilization--Spanish influences--Congresses.
Peru--Relations--Spain--Congresses.
Science--Peru--History--Congresses.
Science--Spain--History--Congresses.
Social sciences--Peru--History--Congresses.
Social sciences--Spain--History--Congresses.
Spain--Civilization--Latin American influences--Congresses.
Spain--Relations--Peru--Congresses.
Princeton subject headings:
Peru--Civilization--Spanish influences--Congresses.
Peru--Relations--Spain--Congresses.
Spain--Civilization--Latin American influences--Congresses.
Spain--Relations--Peru--Congresses.