Columbia subject headings:
Harvard subject headings:
Commodity Exchange, Inc.--Statistics--Periodicals.
Copper--Prices--United States--Statistics--Periodicals.
Gold--Prices--United States--Statistics--Periodicals.
Metal trade--Prices--United States--Periodicals.
Silver--Prices--United States--Statistics--Periodicals.
Princeton subject headings:
Commodity Exchange, Inc.--Statistics--Periodicals.
Copper--Prices--United States--Statistics--Periodicals.
Gold--Prices--United States--Statistics--Periodicals.
Metal trade--Prices--United States--Periodicals.
Silver--Prices--United States--Statistics--Periodicals.