Columbia subject headings:
Harvard subject headings:
Coal trade--Japan--Statistics--Periodicals.
Coke industry--Japan--Statistics--Periodicals.
Energy industries--Japan--Statistics--Periodicals.
Petroleum industry and trade--Japan--Statistics--Periodicals.
Power resources--Japan--Statistics--Periodicals.
Princeton subject headings:
Energy industries--Japan--Statistics--Periodicals.
Power resources--Japan--Statistics--Periodicals.