346865
Discovery and development of the field began the postwar economic boom in the nearby city of Midland in the early 1950s .
 location: Midland
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: Midland 
Answer:
 location: Midland