[glibrary] Change covers on oz books

Some of oz book you have on project Gutenberg website is not the original cover for the EPUB illustration and illustrated pictures book someone will get confused with witch one is the one with illustrated and illustrations pictures like the patchwork girl of oz I couldn’t tell witch one has the illustrated and illustrations version because of the same cover even the ones that are old and faded and just the picture of s horse and not the book cover with the title name on it please fix it