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Low-tech Magazine: Adsense in the 19th century - http://www.lowtechmagazine.com/american-trade-cards.html
"Trade cards were one of the most popular forms of advertising in America during the second half of the 19th century. They were posted and handed out, and people collected them. These cards were made obsolete by the arrival of color print magazines. Today, magazines are about to be made obsolete by the internet. Why can't a banner on a website look like one of these?" ‎- silpol