The West Virginia Department of Culture and History has a list of published Pocahontas County History resources. They provide links to online versions of two resources,
Harper, Enid. History of Knapp's Creek Community Consisting
of the The Hills, Forst, Knapp's Creek and Minnehaha Neighborhoods,
Pocahontas County, West Virginia. Morgantown, West Virginia,
Agricultural Extension Division, 1924 (On-line version).
Xwv 1. Agr 3. 2: H3.
and
Wilson, Mrs. Stanley. History of Minnehaha Springs Community,
Pocahontas County, West Virginia. Morgantown, West Virginia,
Agricultural Extension Division, 1928 (On-line version).
Xwv 1. Agr 3. 2: W5.
Another reference on their list is available in its entirety as a pdf file from Google Books: Historical Sketches of Pocahontas County by William T. Price (1901),