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2. The Atlas of Britain and Northern Ireland , (1963), Clarendon Press, Oxford.
3. Atlas of Canada (1957), Dept. of Mines and Technical Surveys Geographic Branch, Ottawa.
4. The World Almanac and Book of Facts 1976 , Newspaper Enterprise, Assoc., Inc., New York, 1976.
5. Encyclopedia Americana , America Corporation, New York, 1968.