I think the problem with reprinted public domain works comes when you consult the reprint and use those page numbers or accidently copy an editorial change they have made. You have to find the actual original to be copyright free.
In writing my Research book I was amazed to discover two blogs that are devoted solely to tracking down the sources of all the lovely quotes you find on the web. Most are incorrect so don’t use them in your work.
My Research Your Subject came out the week I had emergency surgery so I was unable to do much promo. If anyone wants an ARC, I can send you one. Or you can get it on Amazon. https://amazon.com/gp/product/B0924N5LYC It’s in KU or $2.99. I would love reviews. Thank you, Ana and Linda for reviewing.