ENVIRONMENTAL MANAGEMENT--A TWENTIETH CENTURY PUBLIC HEALTH CHALLENGE.
D000397:Air Pollution; D002170:Canada; D004782:Environmental Health; D005523:Food Supply; D006801:Humans; D011634:Public Health; D011635:Public Health Administration; D012499:Sanitation; D014481:United States; D014881:Water Supply
AIR POLLUTION; CANADA; ENVIRONMENTAL HEALTH; FOOD SUPPLY; PUBLIC HEALTH ADMINISTRATION; SANITATION; UNITED STATES; WATER SUPPLY