B. J. Lloyd y Thorpe, T.,
«Catchment surveillance for water resource management»,
Waterlines, an international journal of water, sanitation and waste, pp. p. 23-25 : 1 map, 3 photogr., 1997.
G. A. Reynoso,
«Manual de evaluacion social en microcuencas». Comision Nacional del Agua, Mexico City, Mexico, p. 76 p. : fig., tab., 1997.
J. Ojendal y Torell, E.,
The mighty Mekong mystery, vol. no. 8. Stockholm, Sweden: SIDA, Swedish International Development Cooperation Agency, 1997, p. 181 p. : 2 boxes, 11 fig., 7 maps, 22 tab.
I. N. Watershed Ahmednagar,
«Watershed Organisation Trust (WOTR) : a conspectus 1993 - 97». Watershed Organisation Trust (WOTR), Ahmednagar, India, p. 12 p. : ill., photogr., 1997.