At the Westfield Comics blog, KC Carlson put Bill the Boy Wonder: The Secret Co-Creator of Batman on his list.
He says that "every comics fan should enjoy this fond look at one of comic books' great 'lost' creators."
(He also says that the book is "primarily...intended for younger readers and children’s libraries"; all true except the "primarily." I call it an all-ages picture book.)
Thank you Westfield Comics and KC Carlson.