The core concept in vector control / by Norman C. Gratz
Gratz, Norman G, Tonn, Robert J, World Health Organization. Equipment, Planning and Operations Unit & Scientific Group on Integration and Management of Vector Control in Primary Health Care (1986 : Geneva, Switzerland). (1986). The core concept in vector control / by Norman C. Gratz. Geneva : World Health Organization. http://www.who.int/iris/handle/10665/58624
Gov't Doc #VBC/PMO/SG/WP/86.32. Unpublished
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