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In presenting this thes i s : in parti al ful f Mmen t o f the-requ i remen t s for an advanced degree at the University of British Columbia, I agree that the Library shall make it freely available for reference and study. I further agree that permission for extensive copying of this thesis for scholarly purposes may be granted by the Head of my Department or by his representatives. It is understood that copying or publication of this thesis for financial gain shall not be allowed without mydoi:10.2307/25605212 fatcat:no3n3x3kdzho3ij7kjirtxw6dm