Harry Whittington wrote a couple of movie tie-ins that I'm aware of - "Charro!" and "Temptations of Valerie". I created ebooks of both of these from scans that I found online. I'm pretty sure that the movie studios that own the rights to these are not interested in them ever being reprinted, so here they are. In the name of preservation. Enjoy!
Charro! by Harry Whittington - EPUB
Charro! by Harry Whittington - MOBI
Temptations of Valerie by Harry Whittington - EPUB
Temptations of Valerie by Harry Whittington - MOBI
Writer Paul Bishop has a terrific post on his blog regarding Charro! and the eye-catching Ron Lesser cover art called Wandering Down The Rabbit Hole that I highly recommend reading.
The movie "Valerie" can be found on YouTube by searching for "ekberg valerie". The description is in Spanish although the movie is English.