@Book{BDCM20214158373, title = "Estad\'{\i}stica gr\'{a}fica : abril 1914", author = "Espa\~{n}a. Direcci\'{o}n General de Obras P\'{u}blicas", publisher = "Madrid : [s.n.]", editor = "[s.n.]", URL = "https://bibliotecavirtualmadrid.comunidad.madrid/bvmadrid_publicacion/es/consulta/registro.do?id=455595", year = "1914", }