user: Question: What cover has a published date of May 27, 2009 (HC) May 20, 2009 (TPB)?
Columns: ['Volume', 'Series', 'Title', 'Cover', 'Published', 'ISBN']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['0', 'Conan', 'Born on the Battlefield', 'Greg Ruth', 'May 21, 2008 (HC) June 18, 2008 (TPB)', '978-1-59307-980-2 (HC) 978-1-59307-981-9 (TPB)']
SQL:

assistant: SELECT "Cover" FROM "Table" WHERE "Published" = 'May 27, 2009 (HC) May 20, 2009 (TPB)';