<http://schema.org/mainEntityOfPage>
<http://www.upi.com/Science_News/2013/02/06/2-Great-Lakes-at-record-low-levels/60851360187849/>
<http://www.upi.com/Science_News/2013/02/06/2-Great-Lakes-at-record-low-levels/UPI-60851360187849/>