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Published online by Cambridge University Press: 01 May 2009
page 138 note 1 Richmond Coal Field, Virginia, by Clifford, William, M.E., read before the Manchester Geological Society 12 6th, 1887.Google Scholar
page 139 note 1 Page 7, idem.
page 139 note 2 Quoted in McFarlan's, “Coal Regions of America,” p. 512,Google Scholar from Lesley's U.S. Railroad and Mining Register, Philadelphia
page 140 note 1 Clifford's paper, p. 13.