Preventive medicine and sanitation through the ages.
D006920:Hygiene; D008511:Medicine; D008887:Military Medicine / Q000266:history*; D008889:Military Personnel; D009326:Naval Medicine / Q000266:history*; D011315:Preventive Medicine; D012499:Sanitation / Q000266:history*
HYGIENE; MEDICINE, MILITARY AND NAVAL/history; MEDICINE, PREVENTIVE; SANITATION/history