revision preference src: Historian Gerald J. Prokopowicz mentioned apprehension toward recognizing Lincoln's role in freeing slaves as well as libertarian attitudes towards the Confederacy in an interview regarding his book Did Lincoln Own Slaves? And Other Frequently Asked Questions about Abraham Lincoln : <SEP> tgt: Historian Gerald J. Prokopowicz mentioned apprehension toward recognizing Lincoln's role in freeing slaves as well as libertarian attitudes towards the Confederacy in an interview regarding his book Did Lincoln Own Slaves? Other Frequently Asked Questions about Lincoln