275707
He specialized in the design of libraries , such as the Olean Public Library and Mount Pleasant Library ( Washington , D.C. ) , two of about a hundred libraries , many of them Carnegie libraries , that he designed in the United States and Canada , and structures for educational institutions .
 None
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
 Entities:  
Answer:
 None