He also worked with publishing houses making encyclopedias to explain the junk; Most of the star wars wikia and wikipedias are sighted from the (STILL CANNON cuz their content is just from the movies); The del rey + lucas books published encyclopedias such as; "Star Wars: new essential guide to weapons and technology" by W. Haden Blackman with illustrations by Ian Fullwood published by Del Rey in conjunction with Lucas Books. If the book has the; starwars.com logo on it and is of the movies or clone wars tv show or rebels tv show or force awakens or rogue one---> it is still cannon.