WARREN, W. D. M. Contour Trenching. Indian Forester, [S. l.], v. 72, n. 12, p. 581–584, 1946. DOI: 10.36808/if/1946/v72i12/22683. Disponível em: https://indianforester.co.in/index.php/indianforester/article/view/22683. Acesso em: 21 aug. 2025.