Robinson has a few books with his illustrations out there available in one form or another, but it seems there ought to be more than are currently itemized. I'm going to keep looking for some, but in the meantime you can see a nice example here, from the 1930s, Sleeping Beauty. I'm going to show the whole book, cover to cover, and would claim generosity except that the book is only 10 pages in its entirety. I'm also including some zoom-in details cuz I really like his pen style.
Robinson's work coulda/woulda been great in fairy tale comic books.