http://www.k2.t.u-tokyo.ac.jp/vision/BFS-Auto/ though this is to scan whole books in case there are rare ones..
https://www.flaticon.com/free-icons/diagram
http://www.k2.t.u-tokyo.ac.jp/vision/BFS-Auto/ though this is to scan whole books in case there are rare ones..
https://www.flaticon.com/free-icons/diagram