Columbia subject headings:
Harvard subject headings:
Agriculture--Economic aspects--Indonesia--Sumatera Timur.
Plantations--Indonesia--Sumatera Timur.
Sumatera Timur (Indonesia)--Economic conditions.
Sumatera Timur (Indonesia)--History.
Princeton subject headings:
Agriculture and state--Indonesia--Sumatera Utara.
Land tenure--Indonesia--Sumatera Utara.
Plantations--Indonesia--Sumatera Utara.
Sumatera Utara (Indonesia)--History.