Helwigh, A.B.

Mark, O., Hung, N.Q. & Helwigh, A.B., 2002. Waiting for a swim - handling wastewater in Asia. , pp.p. 12-15 : 3 fig., 2 photogr. Available at: https://www.ircwash.org/sites/default/files/Mark-2002-Waiting.pdf.