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==Enlaces externos==
*[http://minerals.usgs.gov/minerals/pubs/commodity/stone_dimension/ Dimension Stone Statistics and Information] – United States Geological Survey minerals information for dimension stoneinformación de minerales de piedra de dimensión
*[http://minerals.usgs.gov/minerals/pubs/commodity/stone_crushed/cstonmyb05.pdf USGS 2005 Minerals Yearbook: Stone, Crushed]
*[http://minerals.usgs.gov/minerals/pubs/commodity/stone_dimension/dstonmyb05.pdf USGS 2005 Minerals Yearbook: Stone, Dimension]
