Enllaços:
[1] http://www.ub.edu/minrocind/category/poblaci%C3%B3/comarca-sense-recursos-rellevants-de-roca-ornamental
[2] http://www.ub.edu/minrocind/category/comarca/el-bergued%C3%A0
[3] http://www.ub.edu/minrocind/category/prov%C3%ADncia/barcelona
[4] http://www.ub.edu/minrocind/category/grau-dactivitat/nsnc
[5] http://www.ub.edu/minrocind/Comarca%20sense%20recursos%20rellevants%20de%20roca%20ornamental
[6] http://www.ub.edu/minrocind/sites/default/files/llegenda-mapa-geologic.pdf