David Paulides, the head of the North American Bigfoot Search (the group responsible for kickstarting Ketchum's Bigfoot DNA project), has a new book out and it's called "Missing-411". In the book, Paulides writes about the the hundreds of people who have disappeared or gone missing over the years in U.S. National Parks.
He notes the "geographical clusters of missing people" and whether their cases can be attributed to Bigfoot. The book claims that nobody has ever studied the archives for similarities, traits and geographical clusters of missing people, until now.
Update: Henry May retracts from original statement about Paulides making connection with missing persons and Bigfoot: