1.  Anon.  1898.  Commemorative Biographical Record of Central Pennsylvania, including the Counties of Centre, Clearfield, Jefferson and Clarion.  J.H. Beers & Co., Chicago (Broderbund CD-193).  On p. 114, excerpted from a biographical sketch of the Hon. Leonard RHONE (pp. 113-115):

In 1792 Michael Rhone removed from Berks county to Haines township, Centre county, then a part of Northumberland county, where he purchased a tract of land and began to clear it for a farm.  For some reason he sold the place two years later, and went to the present homestead, which he purchased from Jacob Straub, September 15, 1794.  This place was a part of the first survey in that Valley, the Manor of Nottingham survey, made September 23 and 24, 1766, and the land had previously been deeded to Straub on June 24, 1794, by John Penn, the younger, and John Penn, the elder, by their attorney, Anthoney Butler, of Philadelphia, as shown by documents in the recorder's office in Lewistown, Penn.  The deed to Michael Rhone was recorded at Bellefonte.

The book further tells us Michael RHONE and his wife were buried in Tusseyville, Potter Twp., Centre Co., PA, so I presume the "Valley" mentioned is Penns Valley.

2.  Deryck Holdsworth (Dept. of Geography, Pennsylvania State University, University Park, PA 16802).  1998.  Abstract: Merchants and squatters around the Manor of Nottingham, Pennsylvania: contested frontier land in Penn’s Woods. <link died>  Conference:  "Exploration in Historical Geography," 18-19 Sep 1998, Emmanuel College, Cambridge Univ., UK.  After reading the abstract, I want to read the full paper!  Very relevant to anyone whose ancestors lived in the region.  Here is a quote:

On a visit to his "wild lands" in central Pennsylvania in 1817, the Philadelphia merchant Thomas Cope wrote a diary that provides detailed descriptions of land quality, crop yields, and investment potential -- together with remarkable accounts of rude log shacks and desperate living conditions of German squatters on some of his lands.