[USE OF PUNCHCARD MACHINES IN HYGIENE].
D004813:Epidemiology; D006306:Health Surveys; D006794:Household Articles; D006801:Humans; D006920:Hygiene; D011676:Punched-Card Systems
EPIDEMIOLOGY; HEALTH SURVEYS; PUNCHED-CARD SYSTEMS
POU ZIT'I MATEMATICK'YCH D ERNO ST'ITKOV'YCH STROJU V HYGIEN E.