Rural Water Supply – Constructing Structures for Springs, Technical Note No. RWS. 1.C.1

WFTW (1982): Rural Water Supply – Constructing Structures for Springs, Technical Note No. RWS. 1.C.1. Washington D.C. (USA): Water for the World (WFTW), U.S. Agency for International Development. URL [Accessed: 01.09.2018] PDF