Title: Ėkologii︠a︡ g. Petergofa--Naukograda Rossiĭskoĭ Federat︠s︡ii i sopredelʹnykh territoriĭ
Subjects: Ecology, Congresses
Places: Russia (Federation), Petrodvoret︠s︡, Petrodvoret︠s︡ Region