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Chemicals and Drugs
Complex Mixtures
Biological Products
11
Tissue Extracts
6
Venoms
6
Radioactive Pollutants
5
Waste Products
5
Colloids
4
Particulate Matter
4
Fossil Fuels
3
Tars
2
Soil
1
Acid Rain
Ambergris
Biofuels
Freund's Adjuvant
Lignin
Manure
Phytochemicals
Vehicle Emissions
