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His conversion to geography complete , he became professor of geography at Birkbeck College , London in 1944 , returning to King 's in 1947 as its first professor of geography and remaining until his death in 1963 .
 Birkbeck College , London
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Birkbeck College , London