[Significant and anniversary dates of the history of hygiene and sanitation in 1999].
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D001317:Austria; D049671:History, 18th Century; D049672:History, 19th Century; D049673:History, 20th Century; D006920:Hygiene / Q000266:history*; D007564:Japan; D011634:Public Health / Q000266:history*; D012425:Russia (Pre-1917); D012499:Sanitation / Q000266:history*; D014586:USSR; D014481:United States