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of Rocks. New York: Van Nostrand Reinhold Company. pp. 161–162. ISBN 0-442-26328-7. Anonymous (nd) Hertfordshire Puddingstone., East Herts Rock Club, Ware...11 KB (1,261 words) - 20:00, 6 April 2023
ISBN 0-442-27681-8 R.S. Mitchell, "Dictionary of Rocks", 1985. ISBN 0-442-26328-7 McBride, E.F.; Folk, R.L. (1977). "The Caballos Novaculite Revisited:...35 KB (4,223 words) - 13:56, 11 May 2024
