MJ 1871 p.78
Skillen, B.S., 1992. Nobody Like The Captain: Men of the Mines. Northern Mine Research Society. Memoirs 1992, British Mining Vol.45 p.48.
Woodward, J., 1729. An attempt towards a Natural History of the Fossils of England: in a Catalogue of the English Fossils in the Collection of J. Woodward M.D. London, p.6.