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Marine resources conservation · Waterverontreiniging
The frail ocean
1967
Marine resources conservation
Man and his environment
1971
Juvenile literature · Marine pollution
The protected ocean
1972
Marine resources conservation · Marine resources
The oceans, our last resource
1981
Pollution · Refuse and refuse disposal
Man and his environment: waste
Oil spills
Oilspill
Environmental engineering · Hazardous geographical environments
Acts of God, acts of man
1977
1970