Cover of Seven Is Magic, 1969. Cover perhaps illustrated by Lois Ehlert. Full credits list Tom Cooke,John Kuzich, Jane Teiko Oka, Logan Holtby, Fred Witzig, Donald Silverstein, Richard Powers, Albert John Pucci, Franz Altschuler and David M. McPhail. Think what you will about children’s books, but this one has some really great, technically interesting illustrations. Cheap on Amazon, all the Ginn & Co. books from this time period are really great. Buy them and scan them!