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Rancho Punta de Quentin was a Mexican land grant in present day Marin County , California given in 1840 by Governor Juan B. Alvarado to John B.R. Cooper .
 Marin County , California, Juan B. Alvarado, John B.R. Cooper
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Marin County , California, Juan B. Alvarado, John B.R. Cooper