Dorofeev А. А. On dynamics of ecological tourists quantity in the USA and Russia. HERALD OF TVER STATE UNIVERSITY. SERIES: GEOGRAPHY AND GEOECOLOGY, [S. l.], n. 2 (34), p. 40–52, 2021. Disponível em: https://journal.tversu.ru/index.php/geo/article/view/281. Acesso em: 13 nov. 2024.