006770000a22001930004500 PH-MaWHO 20241108112133.0 European Seminar for Sanitary engineers (3rd : 1952 : London). 644854 Design and operation of septic tanks : proceedings [of the] Seminar held in London, england, 27 October - 1 November 1952. 92-4-140018-8 Geneva : World Health Organization, 1953. (WHO monograph series ; no. 18). 122p. SHZ.AD.3 1953 eng Sewage Europe Congresses 644855 Refuse disposal Europe Congresses 644856 MONO 1633 1633 0 0 0 0 WPRO WPRO 2021-05-23 0 SHZ.AD.3 1953 01633 2024-01-24 00:00:00 2021-05-23 MONO