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Almost all of them are probably in the PD here in the States, at least. That's not a criticism--the quality of them is likely to be much higher than you can get from any of the free book sites.
The one on the chaplain in the Korean War and on the Battle of the Bulge probably aren't in the PD, though. Not enough time has elapsed. However, there are ways for a book that isn't in the PD for time reasons to be granted a Creative Commons license or something so that it is like being in the PD, or almost so. Also, I suppose that the copyright owner could decide to relinquish his/her copyright for some reason.
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