I am no attorney, nor am I an expert on copyright laws, but it seems this is an 18th century publication which all copy rights would have expired, yes, no??
Having said that, would it be ethical and legal to purchase the book and then re-produce for purposes of shop use for sale to others willing to share in the cost?
Just a thought?
I know there was an effort to do something similar with the Moses book, but that still had copyrights in place as I recall.