<http://schema.org/alternativeHeadline>
"The materials show how zoos have changed from the amusement park attractions to the institutions focused on education and conservation of today."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.mnn.com/lifestyle/arts-culture/stories/vintage-zoo-pamphlets-feature-now-extinct-animals-odd-exhibits>