1865-06-07, Richmond Whig; total number of Libby prisoners over the course of the war is estimated at 125,000
From the Richmond Whig, 6/7/1865, p. 2, c. 6
THE WHOLE NUMBER OF UNION PRISONERS confined in the Libby Prison, from the outbreak of the war to its close, is estimated in round figures at one hundred and twenty-five thousand.