00754naa#a2200205#i#450# EN\INFRA-M\bibl\19312 20260103201434.6 2500-0497 20171220b2017####ek#y0engy0150####ca RUS RU Historical aspects of the development of water supply and sanitation systems in the Middle Ages and their impact on the current ecological situation in developing countries Journal article Moscow INFRA-M Academic Publishing LLC. 2017 6 с. Journal article local Всеобщая история. 94 RUS Orlov Evgeniy Vladimirovich Shipkov Oleg Ivanovich Peregudov Denis Aleksandrovich naukaru.ru