A visit to the Philadelphia prison : being an accurate and particular account of the wise and humane administration adopted in every part of that building; containing also an account of the gradual reformation, and present improved state, of the penal laws of Pennsylvania: with observations on the impolicy and injustice of capital punishments. In a letter to a friend. By Robert J. Turnbull. - Turnbull, Robert J. (printed by Budd and Bartram, no. 58, North Second Street, 1796)