First set of 4 sets of map pictographs for U.S. national park maps. PD US Government - National Park Service, U.S. Dept. of the Interior rest of set: http://openclipart.org/media/files/johnny_automatic/6754 http://openclipart.org/media/files/johnny_automatic/6757 http://openclipart.org/media/files/johnny_automatic/6765
NPS地圖像形文字第1部分
cartography、externalsource、map、park、pictograph、sign、symbol
製圖、外部源、地圖、公園、象形文字、標誌、符號
資料來源：openclipart ( https://openclipart.org/ )