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He taught as Professor of Educational History in the Universities of La Plata , El Comahue and La Pampa and authored his first book , Education and Society in Argentina , 1800-1945 , in 1972 .
 organization: La Plata; organization: El Comahue; organization: La Pampa
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 organization: La Plata; organization: El Comahue; organization: La Pampa