A monograph of the ordovician trilobites of the Bala area, Merioneth.
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| Format: | Book |
| Language: | English |
| Published / Created: |
London :
Printed for The Palaeontographical Society,
1962-1968.
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| Series: | Publication (Palaeontographical Society (Great Britain)) ;
no. 116, 118, 120, 122. |
| Notes: | Physical description: 138 p., plates : ill ; 28 cm. |