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A Digital Line Graph ( DLG ) is a cartographic map feature represented in digital vector form that is distributed by the U.S. Geological Survey ( USGS ) .
 U.S. Geological Survey
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 U.S. Geological Survey