In the July issue of the 1884 Dickinsonian, it briefly mentions this short phrase in its 'Miscellany' section. "Hurrah for Co-education!" was placed in this section randomly amongst other short unrelated paragraphs. This phrase is unique because it shows up a few months before the decision to have co-education at Dickinson.
Location of Document in Archives
The Dickinsonian, July 1884, vol. XI, no. 10