Выбор респираторов (NIOSH, США): различия между версиями

'''Wilmes D [1994].''' Letter of May 18, 1994, from Don Wilmes, 3M, to Richard W. Niemeier, Division of Standards Development and Technology Transfer, National Institute for Occupational Safety and Health, Centers for Disease Control and Prevention, Public Health Service, U.S. Department of Health and Human Services.