Ussher, R. J. (1912). Clare Island survey: A biological survey of Clare Island in the county of Mayo, Ireland and of the adjoining district. Hodges, Figgis.
MLA CitationUssher, Richard John. Clare Island Survey: A Biological Survey of Clare Island in the County of Mayo, Ireland and of the Adjoining District. Hodges, Figgis, 1912.
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