@misc{junta2019actors, title = {Actors (companies) and employees - Sand & gravel} author = {Junta de Andalucia}, url = {https://www.juntadeandalucia.es/organismos/transformacioneconomicaindustriaconocimientoyuniversidades/servicios/estadistica-cartografia/actividad/detalle/175134/175628.html}, year = {2019} }