Columbia subject headings:
Economics--Religious aspects--Islam--History.
Peasants--Indonesia--Sumatra--History.
Harvard subject headings:
Economics--Religious aspects--Islam--History.
Islam--Economic aspects--Indonesia--Sumatra.
Peasants--Indonesia--Sumatra--History.
Princeton subject headings:
Islam--Indonesia--Sumatra.
Muslims--Indonesia--Sumatra.
Sumatra (Indonesia)--Commerce.
Sumatra (Indonesia)--Economic conditions.
Sumatra (Indonesia)--History.