Columbia subject headings:
Fossil fuels--Canada--Congresses.
Geology, Stratigraphic--Mesozoic--Congresses.
Petroleum--Geology--Canada--Congresses.
Harvard subject headings:
Coal--Geology--Canada--Congresses.
Coal--Geology--United States--Congresses.
Geology, Stratigraphic--Mesozoic--Congresses.
Geology--Canada--Congresses.
Geology--United States--Congresses.
Petroleum--Geology--Canada--Congresses.
Petroleum--Geology--United States--Congresses.
Princeton subject headings:
Fossil fuels--North America--Congresses.
Geology, Stratigraphic--Mesozoic--Congresses.
Geology--North America--Congresses.