If not available in print, go to your public library. They can request photocopy or loan of Egyptian Ella from several sources, one is sjlibrary.org, which has Egyptian-ella, sheet music 1931, Doyle, Walter, Skinner and Frank; foxtrot 11 parts.
They are located in California, San Jose Public Libraries and San Jose State University.
A list of their holdings here:
http://www.sjlibrary.org/research/special/music_coll/index.html?t=3&l=0&g=E
Since the music is post-1923, institutions will not copy, but some loan.