577.2 Specific factors affecting ecology
577.27 Effects of humans on ecology
577.272 Engineering works 577.273 Agricultural pollution 577.274 War 577.275 Pollution by acids, by specific elements and groups of elements 577.276 Air pollution 577.277 Radioactive pollution 577.278 Pollution by organic compounds 577.279 Pesticide pollution
Dewey Decimal Classification
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