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	1.	No cover image available Perspectives on the qualitative and quantitative improvement of humus in soils of the eastern amazon region by Silva Martins, Paulo Fernando da Brandino, Zeni Goes Cardoso, Antonio Material type: Article; Format: print ; Literary form: Not fiction Language: Eng In: Studies on the utilization and conservation of soil in the eastern amazon region p. 115-118 Availability: No items available.
	2.	No cover image available Qualitative characterization of humic substances of different soils in northeastern Pará by Brandino, Zeni Goes Material type: Article; Format: print ; Literary form: Not fiction Language: Eng In: Studies on the utilization and conservation of soil in the eastern amazon region p. 131-140 : graph. Availability: No items available.
	3.	No cover image available Decomposition of organic matter by Denich, Manfred Brandino, Zeni Goes Blum, Erhard Material type: Article; Format: print ; Literary form: Not fiction Language: Eng In: Studies on the utilization and conservation of soil in the eastern amazon region p. 157-179 : graph., tab. Availability: No items available.

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