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davidcyclebackCard and trading card are two different things. A trading card has to be a card, but it also has to have other qualities (commercial/advertising item sold to the public as a collectible, etc). So, your snapshot of Barry Bonds is not a baseball card.
I pointed out the card definition to show that round card, like the Colgan's Chip, isn't automatically excluded as a card-- even by the dictionary. In fact it has so many other baseball card-like qualities (advertising, sold in product like a Topps card) that I would call it a baseball card.
There are closely related but different collectible areas. For example, scraps (die cut pieces of paper to be pasted on things) are typically considered their own area of collectible. Those 1800s R & S die cuts are scraps.
Also, realize that many of the terms we used today weren't the terms and definitions used today when the items weren't originally collected. For example, some people get hot to trot over the term rookie card as applied to to 1950s cards, but it was either not used or considered of little significance in the 1950s. In other words, the definitions are often modern concoctions applied retroactively. These categories can be good and useful, but aren't inborn to the memorabilia itself.