1999
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T. Richards,
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L. Abrams,
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W. Warner, Haarstad, K., y Lystad, H.,
«Evaluating ecological sanitation systems (EvaSan) for handling human waste». Jordforsk, Norwegian Center for Soil and Environmental Research, As, Norway, p. 111 p. : fig., tab., 1999.
M. Venter-Hildebrand,
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«Long-term vision for water, life and the environment (World Water Vision) : framework paper : water-education-training (W-E-T) towards a sector vision of educators and those to be educated». UNESCO International Hydrological Programme, UNESCO-IHP, p. 53 p. : fig., tabs., 1999.
N. Mukherjee,
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J. J. van Straaten,
«Non conventional (low cost) urban sanitation». Netherlands, Ministry of Foreign Affairs, NEDA, The Hague, The Netherlands, p. 37 p. : fig., tab., 1999.