Copper, P. (2004). Silurian (late Llandovery-Ludlow) atrypid brachiopods from Gotland, Sweden and the Welsh Borderlands, Great Britain. NRC Research Press.
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Chicago-čujuhus (17. p.)
Copper, Paul. Silurian (late Llandovery-Ludlow) Atrypid Brachiopods from Gotland, Sweden and the Welsh Borderlands, Great Britain. Ottawa: NRC Research Press, 2004.
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MLA-čujuhus (9. p.)
Copper, Paul. Silurian (late Llandovery-Ludlow) Atrypid Brachiopods from Gotland, Sweden and the Welsh Borderlands, Great Britain. NRC Research Press, 2004.
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