Steve Wells & Pat Lamb's Book now at 6th edition on CDROM has good listing but no pictures.
Larry Kopp has been doing a series of papers with pictures covering S CA Casinos slot cards, so far Casino Pauma, La Posta, Pala, Valley View, Viejas, Sycuan and others to come.
Jim Munding did a Slot Card and Room Key illustrated paper several years ago on S CA.
which included some card room stuff.