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Historical significance The Baldwin Spencer Building is significant for its connection to Walter Baldwin Spencer , who introduced many of the successive additions early into the next century , these of which included a greenhouse and aquaria .
 Baldwin Spencer, Walter Baldwin Spencer
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Baldwin Spencer, Walter Baldwin Spencer