65881
He spent several weeks in April 1882 at the site of the Gettysburg Battlefield to sketch and photograph the scene , and extensively researched the battle and its events over several months .
 location: Gettysburg Battlefield
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
 Entities: Gettysburg Battlefield 
Answer:
 location: Gettysburg Battlefield