Dr. Delmer Eugene Croft was the Mark Twain of early 20th Century Motivational literature. He peppered his self-help booklets with humorous sayings and sometimes even humorous illustrations. These are facsimile reprints of the original editions. The author published at least seven short books between 1915-1922. He worked and printed his books out of New Haven, Connecticut.
This is a wonderful sixty-four page book called "Supreme Forces of Mind: Fun in Thinking."
This book is all about the "Supreme Forces of Mind. You get
Supreme Force of Joy Thought Supreme Force of Faith Thought Supreme Force of Courage Thought Supreme Force of Selfless Thought Supreme Force of Creative Thought Supreme Force of Positive Thought Supreme Force of Mental Suggestion Supreme Force of Mental Healing Supreme Force of Success Thought
He frequently uses humor and his angle is truly unique in positive thinking.