Thanks for the input! I will update the post. As far as I know it is also inaccurate to state that "ALL" imagery falls under this category. I believe it is the case that this is true for ALMOST all books, but not all books. Am I correct?
Thanks for mentioning my Web site - note that "All imagery from books before the year 1923 is under public domain" is only true of books published in the USA by American authors. It's not true of books from other countries, even when used in the US.