What surface was used on July 17, 1983?
CREATE TABLE table_name_30 (surface VARCHAR, date VARCHAR)
SELECT surface FROM table_name_30 WHERE date = "july 17, 1983"
### Context: CREATE TABLE table_name_30 (surface VARCHAR, date VARCHAR) ### Question: What surface was used on July 17, 1983? ### Answer: SELECT surface FROM table_name_30 WHERE date = "july 17, 1983"