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owen john thomas : in 1972 , lisvane reservoir was designated as a site of special scientific interest , to protect the wintering and migratory birds such as tufted ducks and mallards
owen john thomas : yn 1972 , dynodwyd cronfa ddwr llys-faen fel safle o ddiddordeb gwyddonol arbennig , er mwyn diogelu'r adar gaeafu a mudol megis hwyaid copog a hwyaid gwylltion
