Escher, H.

Escher, H., 1993. Low-cost toilet project at Vikas Kendra, Atghara/West Bengal : report on project review tour from 12th to 17th July 1993, Herrsching, Germany: Indienhilfe. Available at: https://es.ircwash.org/sites/default/files/822-93-11133.pdf.