A second inscription names those involved in the building of the Library. The text reads:
Erected Under the Acts of Congress of
April 15, 1886; October 2, 1888; and March 2, 1889 by
Brig. Gen. Thos. Lincoln Casey
Chief of Engineers U.S.A.
• Bernard R. Green Supt. and Engineer
• John L. Smithmeyer Architect
• Paul J. Pelz Architect
• Edward Pearce Casey Architect