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Subject: Soils
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Subject: Soils--Zinc content
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Electronic Theses & Dissertations
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Theses
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2
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Ecuador
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Soils--Copper content
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Soils--Manganese content
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Evaluation of zinc status of several Ecuadorian soils
Torres, Fernando Pacifico
Text (1974)
Part of
Electronic Theses & Dissertations
The effects of copper applied to organic soil alone and in association with manganese and zinc, on composition of crops and reactions in the soil
Lucas, Robert E. (Robert Elmer), 1916-
Text (1947)
Part of
Electronic Theses & Dissertations
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