Columbia subject headings:
Guillaume, Gustave, 1883-1960--Congresses.
Language and languages--Philosophy--Congresses.
Philosophical anthropology--Congresses.
Piaget, Jean, 1896-1980--Congresses.
Harvard subject headings:
Guillaume, Gustave, 1883-1960--Congresses.
Language and languages--Philosophy--Congresses
Philosophical anthropology--Congresses.
Piaget, Jean, 1896-1980--Congresses.
Princeton subject headings: