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While the mounds had been studied by some travelers , professional excavation under the evolving techniques of archeology did not begin until the 1930 s , under the administration of President Franklin D. Roosevelt during the Great Depression .
 Franklin D. Roosevelt, Great Depression
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:
 Franklin D. Roosevelt, Great Depression