, Birbal. The Manufacture of Turpentine and Colophony at the Imperial Forest School, Dehra Dun. Indian Forester, [S. l.], v. 26, n. 10, p. 497–503, DOI: 10.36808/if/1900/v26i10/15938. Disponível em: http://indianforester.co.in/index.php/indianforester/article/view/15938. Acesso em: 5 dec. 2025.