Contribution to the study of the timber industry in the Hoya del Río Huallaga. Letras, Lima, Peru, v. 13, n. 37, p. 194–210, 1947. DOI: 10.30920/letras.13.37.2. Disponível em: https://revistaletras.unmsm.edu.pe/index.php/le/article/view/1273. Acesso em: 13 sep. 2026.