All that can presently (July 2019) be gleaned about Eddie Cox from sheet music covers and by internet searching is that he has 2 works published between 1915 and 1916.
Of ragtime interest is Take Me to the Midnight Cake Walk Ball (1915) published by Maurice Abrahams Music Co..
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This list is arranged in chronological order and contains 2 works by Eddie Cox.
It does not claim to be complete and represents only the number of items located. Keys:ER(w&m)