Columbia subject headings:
Bolivia--Foreign relations--Peru--Congresses.
Chile--Foreign relations--Peru--Congresses.
Peru--Foreign relations--Bolivia--Congresses.
Peru--Foreign relations--Chile--Congresses.
Harvard subject headings:
Bolivia--Foreign relations--Peru--Congresses.
Bolivia--Foreign relations--Peru.
Chile--Foreign relations--Peru--Congresses.
Chile--Foreign relations--Peru.
Peru--Foreign relations--Bolivia--Congresses.
Peru--Foreign relations--Bolivia.
Peru--Foreign relations--Chile--Congresses.
Peru--Foreign relations--Chile.
Princeton subject headings:
Bolivia--Foreign relations--Peru--Congresses.
Chile--Foreign relations--Peru--Congresses.
Peru--Foreign relations--Bolivia--Congresses.
Peru--Foreign relations--Chile--Congresses.