A bunch of people come to Artifacting looking for the Casa Bonita menu. So in the interest of pleasing the masses, here you go (click on the pictures for larger versions):
Check out this post if your interested in what the food at Casa Bonita looks like.
Cleaning out some family scrapbooks, I found a vintage 1980 Casa Bonita menu. Aside from prices, the menu is virtually identical:
http://www.flickr.com/photos/kaszeta/11821306603