The answer is contained in an E-Sylum article I wrote in April 2006 (vol. 9, no. 15, article 15).

After the Philadelphia Mint made the dies they realized they could not produce the raised letters of names demanded by Expo officials. The task was commissioned to Scovill in Waterbury, Conn. Scovill solved the problem of raised lettering of the winners’ names by using INSERT DIES within the cartouche on the medal’s reverse.

Scovill archives are in the Baker Business Library at Harvard University, where at least half of the names are found in a large Journal.

The Baker Library has the journal in the Scovill archives which recorded the exact inscription on every Columbian Expo award medal. The trouble is that they have only one journal. The order of 23,757 medals required TWO journals to record all those names. One journal is missing. The existing journal is gargantuan! It must be 4 feet tall, with numbers down the left hand side of each page and a nice [Victorian] hand script entry of the insert die lettering. Does the other journal still exist? It may. Keep digging.

{I estimate] In all, it took Scovill two years to complete this striking order even with a small team of workers. Several engravers creating those insert dies. A pressman or two for striking. A finisher to patina the medals. And several clerks to keep the records straight and to enter those names in that journal. Oh! I do hope the other journal exists.

Because of its size I doubt if photocopies could be obtained. I guess microfilm would have to be ordered. Inquire of the Archive Director.