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His most famous , `` ( Ghost ) Riders in the Sky '' , was written in 1948 when he worked for the National Park Service in Death Valley , California .
 organization: ( Ghost ) Riders in the Sky; organization: National Park Service; location: Death Valley , California
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:
 organization: ( Ghost ) Riders in the Sky; organization: National Park Service; location: Death Valley , California