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1by International Conference on the Results of the IHD and on Future Programmes in Hydrology, Paris, 1974, Coordinating Council of the IHD. Working Group on Education and Training in Hydrologyprogramme and meeting document bibliotecaUNESCO
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2by International Conference on the Results of the IHD and on Future Programmes in Hydrology, Paris, 1974, Coordinating Council of the IHD. Working Group on Education and Training in Hydrologyprogramme and meeting document bibliotecaUNESCO