It was an AACA Paddlewheelers & Steamboats page, though that doesn't make much sense. I looked at 100s of steamboat pictures on Bing and couldn't find the source. Maybe it was an ad from 1930 for Daimler-Benz, or from an AACA regional newsletter.
Pic won't come up anymore: an unimpressive steamboat in the background with a couple of attractive 30-yr-old women in a 1928-1932 Mercedes "S" Roadster with an extremely long hood...clearly in new condition. Something along the lines of this ___