Columbia subject headings:
Combustion gases--Congresses.
Fly ash--Congresses.
Gas-turbines--Corrosion--Congresses.
Steam-boilers--Corrosion--Congresses.
Harvard subject headings:
Princeton subject headings:
Combustion gases--Congresses.
Fly ash--Congresses.
Gas-turbines--Corrosion--Congresses.
Steam-boilers--Corrosion--Congresses.