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Report of the PAHO/WHO Working Group on perspectives and possibilities of control and eradication of hydatidosis :held during the XIX International Congress of Hydatidology, San Carlos de Bariloche, Rio Negro, Argentina, 20 to 24 September 1999. by: PAHO/WHO Working Group.; WHO Expert Committee on Specifications for Pharmaceutical Preparations (2005 :); Veterinary Public Health Program (Pan American Health Organization) (Language materials, printed)