<http://schema.org/about>
"Some of the most revealing clues into the state of pollution since the the Industrial Revolution aren't only found within the words and sentences contained in centuries worth of scientific publications -- they're"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.treehugger.com/clean-technology/clues-about-pollution-hidden-in-pages-of-old-books.html>