Columbia subject headings:
Interstate Oil Compact Commission--Periodicals.
Natural gas--United States--Conservation--Periodicals.
Petroleum conservation--United States--Periodicals.
Harvard subject headings:
Natural gas--Conservation--United States--Periodicals.
Petroleum conservation--United States--Periodicals.
Princeton subject headings:
Facsimiles.
Interstate Oil Compact Commission--Periodicals.
Natural gas--Conservation--United States--Periodicals.
Petroleum conservation--United States--Periodicals.