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Humic substance fractions and attributes of histosols and related high-organic-matter soils form Brazil. VALLADARES, G. S. - PEREIRA, M. G. - ANJOS, L. H. C. dos - BENITES, V. de M. - EBELING, A. G. - MOUTA, R. de O.
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2.
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An econometric study of the agricultural labor market in Brazil: a test of subsistence and commercial family farm models. ALVES, E. R. de A.
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