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NMRS; Newsletter Dec/1997; pp.2
NMRS; Newsletter Dec/2001; pp.5
NMRS; Newsletter May/2003; pp.5
Wilson G.V., Eastwood T., Pocock R.W., Wray D.A. & Robertson T. (1922); BGS - Mineral Resources of GB (c1920s) Vol II - Barytes and Witherite; 136 pages