THELEN, Rolph. Aerial Photogaphy and National Forest Mapping. Indian Forester, [S. l.], v. 46, n. 2, p. 68–76, 1920. DOI: 10.36808/if/1920/v46i2/18300. Disponível em: https://indianforester.co.in/index.php/indianforester/article/view/18300. Acesso em: 27 dec. 2025.