Alegre i Nadal P. Recursos i reserves minerals: el cas de Catalunya, 1909-1960. Treb. Soc. Catalana Geogr. [Internet]. 2005 Apr. 8 [cited 2024 Dec. 21];(7-8):15-29. Available from: https://revistes.iec.cat/index.php/TSCG/article/view/11609.001