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1de réir Stocum, David L.Available for University of the Philippines Diliman via Sciencedirect. Click here to access
Foilsithe / Cruthaithe 2013
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2de réir Vogel, Harold L.Available for University of the Philippines Baguio via Cambridge Books Online. Click here to access
Foilsithe / Cruthaithe 2010
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4Foilsithe / Cruthaithe 2007Available for University of the Philippines System via Gale Virtual Reference Library. Click here to access
Electronic Resource -
5Foilsithe / Cruthaithe 2006Available for University of the Philippines System via Gale Virtual Reference Library. Click here to access
Electronic Resource