Columbia subject headings:
Petroleum engineering--Periodicals.
Petroleum engineering--United States--Periodicals.
Petroleum industry and trade--Periodicals.
Petroleum industry and trade--United States--Periodicals.
Harvard subject headings:
Petroleum engineering--Periodicals.
Petroleum engineering--United States--Periodicals.
Petroleum industry and trade--Periodicals
Petroleum industry and trade--United States--Periodicals
Princeton subject headings:
Periodicals.
Petroleum engineering--Periodicals.
Petroleum engineering--United States--Periodicals.
Petroleum industry and trade--Periodicals.
Petroleum industry and trade--United States--Periodicals.