Book Covers for the Great Brain Series

Here are the covers for the specific editions in my collection for all eight of the Great Brain books.  I'm sorry I don't have the original edition for Book 1, as Mercer Mayer's illustration is vastly superior to the Jimmy Osmond movie advertisement.  I feel the same way about the new series of covers that were introduced later that are formatted like the cover for Book 7 below.  Why mess with perfection?  Unfortunately, this is the best I can do at this point in time...