Gass, T.E.

Pashkevich, P.A. & Gass, T.E., 1982. Philippine hand pump program (Barangay water program), (Wash field report no. 54) Arlington, VA, USA: Water and Sanitation for Health Project (WASH). Available at: https://fr.ircwash.org/sites/default/files/232.2-5699.pdf.