Robert Green Ingersoll’s ‘Lectures of Col. R. G. Ingersoll’, Wonderful Free Kindle Classic Book, Deals Authors, Promote Your Book to 4 Million Readers. Become A Bestselling Author. Free Kindle Books – Classics *Lectures of Col. R. G. Ingersoll by Robert Green Ingersoll. Price: Free. Genre: Classic, Literary. Rated: 5 stars on 7 Reviews. 238 pages. ASIN: B082FJZMS4.