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World Health Organization. Veterinary Public Health Unit ,  Canada. Agriculture Canada ,  [World Health Organization/Agriculture Canada inter-agency consultation on strengthening of national and international services in animal production hygiene, Ottawa, 5-7 September 1990]

World Health Organization. Veterinary Public Health Unit ,  [Report of informal meeting of WHO working groups on salmonellosis (immunization in animals) : Orvieto, Italy, 8 April 1990]

WHO Working Group on Control of Salmonella Immunization in Animals (1991: Jena, Germany) ,  World Health Organization. Veterinary Public Health Unit ,  [WHO Working Group on Control of Salmonella Immunization in Animals, 17-21 May 1991, Jena, Germany]

World Health Organization. Veterinary Public Health Unit ,  Canada. Agriculture Canada ,  [World Health Organization/Agriculture Canada inter-agency consultation on strengthening of national and international services in animal production hygiene, Ottawa, 5-7 September 1990]

World Health Organization. Veterinary Public Health Unit ,  [Report of informal meeting of WHO working groups on salmonellosis (immunization in animals) : Orvieto, Italy, 8 April 1990]

WHO Working Group on Control of Salmonella Immunization in Animals (1991: Jena, Germany) ,  World Health Organization. Veterinary Public Health Unit ,  [WHO Working Group on Control of Salmonella Immunization in Animals, 17-21 May 1991, Jena, Germany]