The environmental crisis. Commentary on the 1970 European Conservation Year.
D000383:Agriculture; D000397:Air Pollution; D002245:Carbon Dioxide; D003237:Connecticut; D003634:DDT; D004463:Ecology; D004782:Environmental Health; D005060:Europe; D005308:Fertilizers; D007855:Lead Poisoning; D008452:Maximum Allowable Concentration; D009566:Nitrates; D010933:Plankton; D012945:Social Values; D013672:Technology; D014481:United States; D014837:Voluntary Health Agencies; D014876:Water Pollution
D005308:Fertilizers; D009566:Nitrates; D002245:Carbon Dioxide; D003634:DDT