California (State). Department of Public Health -US

US, C.(State). D., 1969. Proceedings of the symposium on water filtration - the state of the art, Los Angeles, May 16, 1969, Berkeley, CA, USA: State of California, Department of Public Health. Available at: http://fr.ircwash.org/sites/default/files/71CSDPH69-275.1.pdf.