Mormon Fundamentalists

Pam raised the question over what Dewey number to use for the book Escape by Carolyn Jessop (0767927567). The book is already at 2 schools in our district and they have used 921 since it is biographical and 289.3092. 289.3 is a general number for Mormons and adding 092 indicates that it is biographical. This seems like an appropriate number, although if you want to separate it from the general Mormon number the main option that I see is to use 289.33 for "specific branches" of Mormons and then optionally add 092. In looking around at other libraries, it looks like 289.33 has indeed been used for books relating to Mormon Fundamentalism.