Ludwig, H.F.

Ludwig, H.F., 1984. Placing water supply and sewer mains in the same trench : experiences derived from a study in Amman, Jordan, (Environmental sanitation reviews no. 15) Bangkok, Thailand: Environmental Sanitation Information Center, ENSIC. Available at: https://nl.ircwash.org/sites/default/files/262.1-84PL-6157.pdf.