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A monograph on British Ordovician Crinoidea
W. H. C. Ramsbottom · Printed for the Palaeontographical Society
36 sayfa · 1961
Paleontology / Fossil Crinoidea
Geology of the South Wales Coalfield
A. A. Archer, M. A. Calver, M. Mitchell, W. H. C. Ramsbottom, Institute of Geological Sciences · HMSO
216 sayfa · 1968
Geology / Coal