WASHINGTON (AP) - The National Park Service is issuing a series of trading cards to commemorate the 150th anniversary of the Civil War.

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Officials say 189 collectible trading cards will be available. The cards' topics range from major battles and famous generals to historic sites and presidents. Visitors to sites such as Antietam National Battlefield or Ford's Theatre can earn cards by answering questions about the site they are visiting or by participating in programs at the site.

The cards are free, and collectors can travel to 23 participating sites to collect them.