Walton, N. 1796. A Section of Strata met with in working Lead Mines in the Manor of Alston Moor and at Dufton Fell in the Counties of Cumberland and Westmoreland. MSS in Banks Papers. Sutro Library, San Francisco. See: http://westgarthforster.blogspot.com/2015/06/the-reverend-william-turner-on.html
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