[I.R. Khetsrov and his contribution in the sanitation of water supplies in the USSR].
Poddubnyi
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MV
D049672:History, 19th Century; D049673:History, 20th Century; D012499:Sanitation / Q000266:history*; D014586:USSR; D014881:Water Supply / Q000266:history*
I.R.Khetsrov i ego vklad v delo sanitarnoi okhrany vodoemov v SSSR.