@misc{instituto2018mapa,
  title = {Mapa de suelos de Cataluña}
  author = {Instituto Cartográfico y Geológico de Cataluña},
  url = {https://www.icgc.cat/en/Public-Administration-and-Enterprises/Downloads/Geological-and-geothematic-cartography/Soil-cartography/Mapa-de-sols-1-250.000},
  year = {2018}
}