9939
Later , Christopher Gist and George Washington surveyed the land in 1751 and 1770 , respectively .
 person: Christopher Gist; person: George Washington
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 person: Christopher Gist; person: George Washington