PE in poultry: Variety of factors found to affect control of avian pneumoencephalitis
J. R. Beach, Experiment Station, Berkeley.
California Agriculture 2(6):13-16. DOI: 10.3733/ca.v002n06p13.
Not available – first paragraph follows:
The virus of PE—avian pneumoencephalitis, pneumo or Newcastle disease—recently was isolated from the air of a poultry house containing an infected flock.
J. R. Beach is Professor of Veterinary Science and Veterinarian in the Experiment Station, Berkeley.