An ad for <i>Adventures of Huckleberry Finn</i> from the back of the sales prospectuses canvassers used to sell the book door-to-door.
Charles L. Webster &amp; Co.
<a rel="nofollow" class="external free" href="http://etext.lib.virginia.edu/twain/twaads.html">http://etext.lib.virginia.edu/twain/twaads.html</a>