Someone just pointed out on one of the online ship modeling forums that there is a neat exhibit recently opened (August 1st) of clipper ship advertising cards. The exhibit is at the Bancroft Library of the University of California, Berkeley, and is accessible M-F from 9am to 5pm. It runs now through February 2014.
There is a nice article about it on SFGate here: The beauty of the Clipper ship and the age of advertising. And the library’s exhibit page can be be viewed here: On Exhibit.