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Water Pollution
Take action for saving Lake Darling.
Silt menaces Okoboji Lake.
Heated water is fish threat.
Farmers assail 'thick, black slime' in creek.
'Secret' pollution.
Health officials list 2 pollution sites.
Fear hides, entrails will get in river.
Federal funds for pollution.
Putrid water at Ottumwa laid to Des Moines.
Health peril in Des Moines River.
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