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p069556431
p069556431
http://data.bibliotheken.nl/id/thes/p069556431
Nitrogen economy in tropical soils : proceedings of the international symposium on nitrogen economy in tropical soils, held in Trinidad, W.I., January 9-14, 1994 / ed. by N. Ahmad
Vertisols and technologies for their management / ed. by N. Ahmad, A. Mermut
Pedogenesis and soil taxonomy
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p069556431
http://data.bibliotheken.nl/id/thes/p069556431