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7. Mike Mehring, Sales Manager of Central Roofing, Minneapolis, MN, 612-408-1400 <br /> Conversation with Mike happened on April 14th, 2016 <br /> 8. European Federation of Green Roof Association. Benefits of Extensive Green Roofs. 20 <br /> Apr. 2013. Web. 4 May. 2016. <br /> 9. Center for Watershed Protection. Watershed Protection Division. Stormwater <br /> Management Guidebook. 2015. Webinar. Accessed: 5 Feb. 2016 to 5 May. 2016. <br /> 14 <br />