ADVANCE FOR SATURDAY MAY 13 AND THEREAFTER - In a Thursday, May 4, 2017 photo, Rodney Botts pulls up the PocketSights app with his phone on Thursday, May 4, 2017 near the corner of N. 7th Street and Columbia Streets in Burlington, Iowa. Burlington residents are encouraged to download the free app where they can start a walking tour of Heritage Hill Historic District, which was designed by Botts. (Ben Roberts/The Hawk Eye via AP)
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