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Quelques aspects du problème des sédiments corrélatifs en climat tropical humide / J.P. Bakker.
- Borntraeger,
- 1957.
- Berlin :
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Report to the government of Brazil on agriculture in Northeastern Brazil and means of improvement / by J.P. van Aartsen.
- 878.4
- FAO,
- 1957.
- Rome :
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Report to the government of Trinidad and Tobago on the reclamation of the Caroni, Oropouche and Nariva areas / by Dwars, Heederik en Verhey ; covering the field assignment of J.P. der Weduwen and L.M. Leupen.
- 877.5
- FAO,
- 1957.
- Rome :