234708
One was published in May 1851 ( " Wait For The Wagon : Ethiopian Song " ) in Baltimore , Maryland , and it was attributed to George P. Knauff .
 Baltimore , Maryland, P.
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Baltimore , Maryland, P.