user: Question: What are the listings in the Valdez-Cordova (census area) Borough?
Columns: ['Name', 'Built', 'Listed', 'Location', 'Borough']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['Alaska Central Railroad Tunnel No. 1', '1906, 1916', '1977-11-28', 'Seward', 'Kenai Peninsula']
SQL:

assistant: SELECT "Listed" FROM "Table" WHERE "Borough" = 'Valdez-Cordova (census area)';