Question: Lincoln the Unknown is a biography of Abraham Lincoln, written in what year, by Dale Harbison Carnegie, was an American writer and lecturer and the developer of famous courses in self-improvement, salesmanship, corporate training, public speaking, and interpersonal skills?
Sentence (from "Dale Carnegie"): He also wrote "How to Stop Worrying and Start Living" (1948), "Lincoln the Unknown" (1932), and several other books.
Relevant evidence: No