Columbia subject headings:
Harvard subject headings:
Aymara language--Congresses.
Indians of South America--Andes Region--Languages--Congresses.
Quechua language--Congresses.
Spanish language--Andes Region--Congresses.
Princeton subject headings:
Aymara language--Congresses.
Indians of South America--Andes Region--Languages--Congresses.
Quechua language--Congresses.