A Pennsylvania State University researcher said he mapped all 3,313 reported Bigfoot sightings between 1921 and 2012. Pennsylvania State University doctoral candidate Josh Stevens said he mapped and graphed all the sightings compiled by the Bigfoot Field Researchers Organization, and found the most sightings came from the Ohio River Valley, Mississippi River Valley, the Sierra Nevada mountains, central Florida and the Pacific Northwest, The Kansas City (Mo.) Star reported Monday. \"Every now and then a data set comes along that just has to be mapped. This is one of those times,\" Stevens wrote on his website, Joshuastevens.net. \"Right away, you can see that sightings are not evenly distributed,\" Stevens wrote. \"There are distinct regions where sightings are incredibly common, despite a very sparse population. \"On the other hand, in some of the most densely populated areas, Sasquatch sightings are exceedingly rare... The terrain and habitat likely play a major role in the distribution of reports (note: reports, not Sasquatch themselves!),\" he wrote.