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Mildenhall had seen the need to officially document the growing national capital in photographs , and offered his services to the Department of Works & Railways in 1921 ; an offer which was readily accepted .
 Mildenhall
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Mildenhall