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 typesetting would only be subject to a "typographical copyright", which has a fixed term of 25 years. It will, therefore, be long expired for a 1956 publication.