00744naa#a2200193#i#450# EN\\bibl\16686 /en/manage/index 20250127194145.1 1995-042X 20170630b2017####ek#y0engy0150####ca RU ENVIRONMENTAL SERVICES OF NATURAL SYSTEMS OF THE VOLGA-AKHTUBA FLOODPLAIN AS THE BASIS OF ITS RECREATIONAL POTENTIAL Journal article CHERKIZOVO Russian State University of Tourism and Service 2017 10 с. Journal article local Туристско-экскурсионное обслуживание. 71.37 grnti Sanin Aleksandr Yur'evich Koshovskiy Timur Sergeevich fht.editorum.ru /en/manage/index