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The Fauna of the Derfel Limestone of the Arenig District, North Wales
Whittington, H. B., Williams, A.Volume:
238
Journal:
Philosophical Transactions of the Royal Society B: Biological Sciences
DOI:
10.1098/rstb.1955.0004
Date:
March, 1955
File:
PDF, 8.20 MB
1955