El virus del Nilo Occidental : cómo proteger a sus caballos
By: Departamento de Agricultura de los Estados Unidos, Servicio de Inspección Sanidad Agropecuaria.
Contributors: United States. Animal and Plant Health Inspection Service.
Edition: [Rev. ed.]
Series: APHIS 91 -- 45-015S.; APHIS 91 -- 45-015S.
Publisher: United States. Animal and Plant Health Inspection Service
Published: 2004
Place of publication: [Washington, D.C
Language: spa
Subjects: West Nile virus -- United States.; Equine encephalomyelitis -- United States.; Mosquitoes -- United States.
Notes: Caption title.

"Revisado un poco en septiember de 2004."

Also issued online.