Question: What was the format for catalog 660-51-015?
SQL: SELECT "Format" FROM "2-18351753-2" WHERE "Catalog" = '660-51-015';

Question: Which region had the year May 1974?
SQL: SELECT "Region" FROM "2-18351753-2" WHERE "Year" = 'May 1974';

Question: Which region had a year March 10, 1998?
SQL: SELECT "Region" FROM "2-18351753-2" WHERE "Year" = 'March 10, 1998';