The Silurian system founded on geological researches in the counties of Salop, Hereford, Radnor, Montgomery, Caermarthen, Brecon, Pembroke, Monmouth, Gloucester, Worcester and Stafford ; with descriptions of the coal-fields and overlying formations / by Roderick Impey Murchison ; a catalogue of the fossils illustrated in part II /
Smith, J. D. D.
Murchison, Roderick Impey,Sir,1792-1871.
Keyworth : British Geological Survey,
1989.
Geology, Stratigraphic