It's been a while since I've had a Rand McNally book with a cover by W. W. Denslow to feature. Here's
Under the Ban, a South Carolina romance from 1898. I think this is one of Denslow's most streamlined and graphic covers!

This is the third variation of this cover that I'm aware of. It is a later printing of the design - two earlier versions (seen below, courtesy of Cindy Ragni) carry Denslow's hippocampus signature at the bottom of the woman's skirt, and use gold ink on the title, author's name, the woman's hair, and her bow. What appears to be the earliest version also features a blue background at the top of the cover, where the book title appears, and carries the design to the rear cover.
On the copy I'm showing, the seahorse is gone and the author's name is now stamped in white ink, along with the woman's hair and bow. Also, the rear cover is blank. I'm quite surprised by how difficult these titles can be to find, when they clearly went through a number of printings!

As it happens, I've also run across another Denslow cover, this time a paperback. This one is
"There Is No Devil", and it features a cover design that could easily double as a poster for the book. This is one of a number of titles published in paperback by Rand McNally that don't seem to exist in hardcover versions with Denslow covers.