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Doorenbos was also responsible for the introduction of the Himalayan Elm Ulmus wallichiana to Europe , cuttings of which he obtained from the Arnold Arboretum in 1929 ; the species was later to play a major role in the Dutch elm breeding programme .
 Doorenbos, Europe
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Doorenbos, Europe