GIBBONS, William H. Logging in the Douglas Fir Region. Indian Forester, [S. l.], v. 47, n. 3, p. 141–144, 1921. DOI: 10.36808/if/1921/v47i3/18392. Disponível em: http://indianforester.co.in/index.php/indianforester/article/view/18392. Acesso em: 4 dec. 2025.