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, y 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., y 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.