State of the Map 2018に関連する資料:OpenStreetMap and Wikimedia(PDF)https://commons.wikimedia.org/wiki/File:OpenStreetMap_and_Wikimedia_(State_of_the_Map_2018).pdf とMaps based on Wikidata queries https://www.wikidata.org/wiki/Wikidata:WikiProject_Wikidata_for_research/State_of_the_Map_2018