Virology in agriculture; papers presented at a symposium held May 10-12, 1976, Beltsville, MD (USA)

agricultura agriculture animal diseases biologia molecular control de enfermedades disease control enfermedades de los animales fiebre aftosa foot and mouth disease immunisation immunization maladie des animaux molecular biology nucleic acids plant viruses virologia virologie virology virose viroses virosis virus virus de las plantas viruses