@Misc{BMDB20200021926, title = "Afrika in 6 blattern imm massstab von 1:10000000", publisher = "Gotha : Justus Perthes", editor = "Justus Perthes", URL = "https://bibliotecavirtual.defensa.gob.es/BVMDefensa/es/consulta/registro.do?id=83604", year = "1890", }