I purchased a 3x5" the heavenly life by james allen given to his son leon in 1929..do you know anything about this?

James Allen the author died in 1912.

From Bookfinder.com

James Allen (1864–1912) was a philosophical writer of British nationality known for his inspirational books and poetry. He worked as an executive secretary for a large company. At age 38, inspired by the writings of Leo Tolstoy, he retired from employment. Allens books illustrate the use of the power of thought to increase personal capabilities. Although he never achieved great fame or wealth, his works continue to influence people around the world, including the New Thought movement. Allens most famous book, As a Man Thinketh, was published in 1902. It is now considered a classic self-help book. Amongst his other works are Above Lifes Turmoil (1910) and The Way of Peace (1907).

Usually the back of the title page will tell you who published the book, and the publication date. What does yours say?