Columbia subject headings:
Coal trade--Europe--Periodicals.
Europe--Economic conditions--Periodicals.
Steel industry and trade--Europe--Periodicals.
Harvard subject headings:
Coal trade--Europe--Periodicals.
Europe--Economic conditions--Periodicals.
Steel industry and trade--Europe--Periodicals.
Princeton subject headings:
Coal trade--European Economic Community countries--Periodicals.
Steel industry and trade--European Economic Community countries--Periodicals.