Columbia subject headings:
Carbonate rocks--Congresses.
Natural gas--Geology--Congresses.
Organic geochemistry--Congresses.
Petroleum--Geology--Congresses.
Harvard subject headings:
Carbonate rocks--Congresses
Carbonate rocks--Congresses.
Natural gas--Geology--Congresses
Organic geochemistry--Congresses.
Petroleum--Geology--Congresses
Princeton subject headings:
Carbonate rocks--Congresses.
Natural gas--Geology--Congresses.
Organic geochemistry--Congresses.
Petroleum--Geology--Congresses.