Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### 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"