Columbia subject headings:
Indians--Agriculture--Congresses.
Indians--Ethnobotany--Congresses.
Plants--Migration--Congresses.
Harvard subject headings:
Indians--Agriculture--Congresses
Indians--Ethnobotany--Congresses.
Plants--Migration--Congresses.
Princeton subject headings:
Indians--Agriculture--Congresses.
Indians--Ethnobotany--Congresses.
Plants--Migration--Congresses.