https://geoscan.nrcan.gc.ca/starweb/nrcanphoto/servlet.starweb?path=nrcanphoto/nrcanphotofastlink_f.web&search1=R=56173
Natural Resources Canada, 2005
Sanford, B. V., Keeseville Formation in a roadcut exposed on Interstate 81, fullsection., Natural Resources Canada Photo Collection # 2008-100, 2005
Photographie