Click here magazine has just issued a review of The Art of American Book Covers, 1875-1930. 

They say :

"Whether you curl up and read it, shelve it for reference, or place on the coffee table, this is one book you don’t want to miss"

Be sure to scroll down and click on the sample images from the book.  They enlarge sharply to fill almost the entire screen, and then show captions. Clicking again shrinks them back into the page.