Template:R:cy:CECP1
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Cymdeithas Edward Llwyd (1994) Creaduriaid Asgwrn-Cefn: pysgod, amffibiaid, ymlusgiaid, adar a mamaliaid [Vertebrates: fish, amphibians, reptiles, birds and mammals] (Cyfres Enwau Creaduriaid a Planhigion; 1)[1] (in Welsh), Tal-y-bont: Y Lolfa, →ISBN