57983
A U.S. Geological Survey later concluded that the most likely cause of the contamination was the disposal of industrial wastewater into the city 's sewer and storm-water systems during the 1940s to 1970s .
 organization: U.S. Geological Survey
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: U.S. Geological Survey 
Answer:
 organization: U.S. Geological Survey