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_79 (league VARCHAR, year VARCHAR, position VARCHAR)
### Question:
What is the league of the third baseman player before 1973?
### Answer:
SELECT league FROM table_name_79 WHERE year < 1973 AND position = "third baseman"