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Cyhoeddiadau

Howlett, P. A catalogue of the mounted animals in the collection of the National Museum and Gallery, Cardiff. Amgueddfeydd ac Orielau Cenedlaethol Cymru. (cyhoeddiad mewnol)

Howlett, P. 'Report on bird ringing in Wales during 1997' Welsh Birds Vol. 2 No. 2 1998 70-82. Welsh Ornithological Society. Cyhoeddir yr adroddiad blynyddol hwn ers 1990.