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.
T. Nadu - I. N. Board,
« Handpump caretaker training ». Tamil Nadu Water and Drainage Board, Madras, India, p. 41 p. : ill.
M. Segall, Haddon, B., T. Azzani, H. - A., et Topo, L.,
« Health through district focus : phase III mid-term review, Kenya-Finland Primary Health Care Programme ». FINNIDA, Ministry of Foreign Affairs, Helsinki, Finland, p. 2 vol. (64, 98 p.): fig., tab.
G. B. National I. Silsoe,
« Simple water pump ». National Institute of Agricultural Engineering, Silsoe, UK, p. 8 p. : techn.drwng.
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.