00753naa#a2200205#i#4500001002200000005001700022011001400039100004100053101000800094102000700102200019400109210005100303215001000354608002700364675004500391700003300436700002800469700003600497856001400533EN\INFRA-M\bibl\1931220250116160616.4##a2500-0497##a20171220b2017####ek#y0engy0150####ca0#aRUS##aRU1#aHistorical aspects of the development of water supply and sanitation systems in the Middle Ages and their impact on the current ecological situation in developing countrieseJournal article1#aMoscowcINFRA-M Academic Publishing LLC.d2017##a6 с.##aJournal article2local##aВсеобщая история. 94zRUS#1aOrlovgEvgeniy Vladimirovich#1aShipkovgOleg Ivanovich#1aPeregudovgDenis Aleksandrovich4#azh-szf.ru