Henry Clay Witney, Life and Works of Abraham Lincoln (1907)
“ In his youth, Lincoln might have been encountered in a cabin loft, or under a tree, or anywhere in the shade, or in some out-of-the-way place, intent on his book. He would record his lucubrations on a wooden fire shovel, then shave it off with a draw-knife, and repeat the performance. While in the field at work he would be immersed in deep thought. As soon as he reached his home or his shelter, he would resume his book, if he had one, or his charcoal sketches, if he had none. ”
