ศาสตร์เกษตรดินปุ๋ย : ขอบคุณแหล่งข้อมูล : หนังสือพิมพ์ The Nation

http://www.nationmultimedia.com/national/A-history-of-recent-mass-shooting-in-the-US-30288201.html

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The mass shooting in Orlando early Sunday was a great tragedy, but it was not a first. Here are five other recent shootings that shook the USA.