61828
Ammonia and ammonium salts are also found in small quantities in rainwater , whereas ammonium chloride ( sal ammoniac ) , and ammonium sulfate are found in volcanic districts ; crystals of ammonium bicarbonate have been found in Patagonia guano .
 Patagonia
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Patagonia