1.
Ecological Principles of Agriculture
by McSorley, Robert, Powers, L...
ISBN: 9780766806535
List Price: $145.95
2.
Principios Ecologicos En Agricultura
by Powers, Laura E., McSorley,...
ISBN: 9788428327848
List Price: $45.95
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Principios Ecologicos En Agricultura (Spanish Edition)
by Laura E. Powers, Robert McS...
ISBN: 9788428331180
List Price: $0.04