P. Calvert,
« Compost toilets : practical action, technology challenging poverty ». The Schumacher Centre for Technology and Development, Rugby, UK, p. 5 p. : 1 fig.
Empresa de Acueducto y Alcantarillado de Cali S.A. ESP -Cali, CO, ACUACALI, Cali, C. O. Universida, et Cali, C. O. C. I. N. A. R. A. -,
« Conozcamos y cuidemos nuestro alcantarillado ». Empresa de Acueducto y Alcantarillado de Cali S.A. ESP – ACUACALI, Cali, Colombia, p. 22 p.
S. Africa. De ZA,
« Sanitation technology options ». South Africa, Department of Water Affairs and Forestry, Pretoria, South Africa, p. 30 p.; ill.; techn. drwng; tab.; fig.
K. Nimpuno,
« Sewage disposal in developing countries : a survey of methods ». Bouwcentrum International Education (BIE), Rotterdam, The Netherlands, p. 49 p. : fig., tab.
G. B. National I. Silsoe,
« Simple water pump ». National Institute of Agricultural Engineering, Silsoe, UK, p. 8 p. : techn.drwng.
J. C. Royer,
« Standard detail drawings - waterworks : a job - aid ». Pan American Health Organization (PAHO), Bridgetown, Barbados, p. 29 p.: techn.drwngs.
E. W. Golding,
« Windmills for water lifting and the generation of electricity on the farm », vol. no. 17. Food and Agriculture Organization (FAO), Rome, Italy, p. ii, 60 p. + 6 p. annexes.