Upper Aeronian and Lower Telychian (Llandovery) graptolites from western mid-Wales /
David K. Loydell.

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Item Link Original Source
Limited (search only)   v.146:1(1992) University of Illinois at Urbana-Champaign
Limited (search only)   v.146:2(1992) University of Illinois at Urbana-Champaign
Limited (search only)   v.146:3(1992) University of Illinois at Urbana-Champaign