CREATE TABLE table_39929 ("Date" CLOB, "Centerfold model" CLOB, "Interview subject" CLOB, "20 Questions" CLOB, "Pictorials" CLOB)

Which Date has a Pictorials of mercedes mcnab, girls of hawaiian tropic?
SELECT "Date" FROM table_39929 WHERE "Pictorials" = 'mercedes mcnab, girls of hawaiian tropic'
SELECT "Date" FROM "table_39929" WHERE "Pictorials" = 'mercedes mcnab, girls of hawaiian tropic'