Ingold, D.L.

Eilerts, G.S., Ingold, D.L. & Lutheran World Relief -New York, NY, US, 1980. PMB puisard maraicher en beton = PMB shallow well construction 2nd exp. ed.nd ed., New York, NY, USA: Lutheran World Relief. Available at: https://www.ircwash.org/sites/default/files/212.5-80SH-1028.pdf.