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FILE - A Big Bend National Park sign at the west side entrance near Maverick Junction, May 24, 2019, in Big Bend National Park in Texas. (Jacob Ford/Odessa American via AP)

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As Yellowstone and other national parks end a two-month shutdown due to the coronavirus, park officials want visitors to take precautions, such as washing their hands, keeping a safe distance from other people and wearing masks in public.