This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Keywords from Image Description:
Ulman. Knights my diagram Transferred from org en Original uploader was SuzanneKn at org en Released into the public domain by the author multiple nuclei model svg en SuzanneKn Multiple nuclei model svg original upload log page en Ulman SuzanneKn bytes no Knights my diagram Urban studies and planning