00639naa#a2200193#i#450# EN\\bibl\17745 20240424074624.3 1995-042X 20170807b2017####ek#y0engy0150####ca RUS RU LENINGRAD REGION – THE TERRITORY OF ECOLOGICAL TOURISM Journal article CHERKIZOVO Russian State University of Tourism and Service 2017 13 с. Journal article local Туристско-экскурсионное обслуживание. 71.37 grnti ZHUKOV Pavel V. LEBEDEVA Maria Yu. rguts.editorum.ru