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phyllis willbach ross
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Costs for applying recommended management practices on agricultural land
Phyllis Willbach-Ross · Southeast Michigan Council of governments
55 sayfa · 1978
Agricultural pollution / Michigan
Understanding stormwater management
Lillian F. Dean, Peggy B. Johnson, Phyllis Willbach-Ross, Clinton River Watershed Council (Mich.) · Clinton River Watershed Council
42 sayfa · 1984
Watershed management / Michigan / Runoff