H. W. de Koning,
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N. Ministere NE,
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H. W. de Koning,
«La salud ambiental y la gestion de los recursos de agua dulce en las Americas», vol. no. 10. Pan American Health Organization, Environmental Health Program, Washington, DC, USA, p. iii, 76 p.: 12 fig., 15 tab., 1992.
W. Schaefer,
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P. Heeres,
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