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GHEURY (De Bray M E J), . (1928). Exponentals made easy. London: Macmillan & Co. Ltd.
GHEURY (De Bray M E J), . 1928. Exponentals made easy. London: Macmillan & Co. Ltd.
GHEURY (De Bray M E J), . Exponentals made easy. London: Macmillan & Co. Ltd. 1928.