Just another example of an image that I scanned from the Dover book and colorized. I kind of like it!
Now, the correction: in reviewing Fishman’s book on the Public Domain, I am reminded that the term “copyright free” is not synonymous with “public domain”. From Fishman, page 3/27,
The words “copyright free” are often used to describe works (particularly photos and clip-art) that are under copyright, copies of which are sold to the public for a set fee rather than under a royalty arrangement.
So it remains to be seen whether these images are in fact in the public domain. These old style woodcuts appear to be of a style which suggests they predate possible copyright protections, but I suppose it’s vaguely possible that they are not public domain.
Till then, enjoy the images under the appropriate use of their “license”. I’ll investigate more, and probably end up writing them to find out what they think their position is.