https://geoscan.nrcan.gc.ca/starweb/nrcanphoto/servlet.starweb?path=nrcanphoto/nrcanphotofastlink_f.web&search1=R=56186
Natural Resources Canada, 2005
Sanford, B. V., Typical exposure of Keeseville Formation near Ellenburg,New York., Natural Resources Canada Photo Collection # 2008-113, 2005
Photographie