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make a notice to be out up outside wildlife sanctuary or a national park advising visitors not to go due to the recent constructions happening in that part of the park

Answer :

NOTICE
RESTRICTION TO THE PARK
DATE                       
START THE NOTICE
SIGNATURE OF OFFICIAL 
                                       NOTICE
                            Jim Corbett National Park
3 June 2015
                    Requesting not to enter the construction area
Some construction work is on progress at the part of tigers. So,visitors are requested not to enter that area since it is prohibited for them.

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