1992
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J. Margat,
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1991
P. Silfverberg et Yletyinen, P.,
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J. Pickford,
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M. X. Comision N. City, Jiutepec, M. X. Instituto, et IWRA -Urbana, IL, US,
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M. F. Baldwin,
« Natural resources of Sri Lanka : conditions and trends ». Natural Resources, Energy and Science Authority of Sri Lanka, Colombo, Sri Lanka, p. xi, 280 p.: fig., tab., maps, photogr., 1991.
P. Heyns,
« Perspective on water affairs ». Namibia, Department of Water Affairs, Investigations and Research, Windhoek, Namibia, p. 63 p.: 5 fig., 5 maps, 27 tab., 1991.
UNDP -New York, NY, US et UNDTCD -New York, NY, US,
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Z. Kaczmarek,
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F. I. F. I. N. N. I. D. A. - Helsinki et Zanzibar (State). Ministry of Water, Energy, Construction, Land and Environment -TZ,
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