16876
As noted in the Encyclopedia of Library and Information Science : It was organized and headed by Rosalia Plekhanov-Bograd , the widow of the founder of Russian Marxism , and immediately became the most important centre of scholarly analysis of the theoretical legacy left by that prominent thinker .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
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