All
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G03 Environment and Public Health D004778 +
G03.230 Environment D004777 +
G03.230.132 Energy-Generating Resources D004736 +
G03.230.132.258 Fossil Fuels D005579 +
G03.230.132.258.108 Coal D003031 +
G03.230.132.258.630 Petroleum D010578 +