Originally Posted by bobcdy
From these two replies, it seems that if the reprint is a facsimile reproduction of the original edition, then it is public domain. If the reprint is newly typeset, then probably the typesetting is copyrighted and so a scan of that type of reprint would not be permitted.
Thanks for the rapid and informative replies!
The scan might be copyrighted, but if you OCRed the scan the resulting text file would not be under copyright.