The site CollegeNews.com published a story "A Pizza History of America" by author Bob Kennedy. Straw Hat Pizza was mentioned:
"Straw Hat Pizza, a huge Western chain of California-style pizzerias, debuted in 1959; Pizza Hut bought out the company-owned locales in the 80s, but most of the franchisees kept the name and recipes."
Check out the full article on their website:
http://www.collegenews.com/article/a-pizza-history-of-america