Fossilized Human Footprint Found in Massachusetts (sources)

  • "Impressions (chiefly Tracks) on Alluvial Clay, in Hadley, Mass.," by Charles H. Hitchcock, article in The American Journal of Science and Arts, May 1855. Pg. 391-396


  • Mysteries of the Unexplained, by Reader's Digest Association, 1982 Pleasantville, New York, USA, & Montreal, Canada. ISBN: 0-89577-146-2. Pg. 34