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Built between 1934 and 1938 by the Bureau of Reclamation , it is high , of which are below the riverbed ( the deep excavation was necessary in order to reach the bedrock on which the foundation of the dam was built ) , making it the deepest dam in the world .
 Bureau of Reclamation
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 Bureau of Reclamation