48631
He conducted his first experiment in 1953 in the polluted woodland of Birmingham , and his second experiment in 1955 in Birmingham as well as in the clean woods of Dorset .
 Birmingham, Birmingham, Dorset
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Birmingham, Birmingham, Dorset