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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 Methods for monitoring organic matter in soil by Lenthe, Hans-Rudolf 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. 119-129 : graph. Availability: No items available.
	3.	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.
	4.	No cover image available Humus et civilisations by Keillings, J Material type: Text; Format: print ; Literary form: Not fiction Language: Fre Publication details: Paris : Université de Paris-Institut des hautes études de l'Amérique Latine-IHEAL, 1956 Availability: Items available for loan: Biblioteca IFEA (1)Call number: Agr7. Place hold
	5.	No cover image available Purification de préparations de substances humiques par élimination d'hydrates de carbone et de composés azotés by Roulet, Nicolas Material type: Text; Format: print ; Literary form: Not fiction Language: Fre Publication details: Zurich : Ecole polytechnique fédérale, 1964 Dissertation note: Th. Doct.Sciences Techniques Availability: Items available for loan: Biblioteca IFEA (1)Call number: Agr130. Place hold

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