CREATE TABLE table_49487 ("Year" FLOAT, "Player" CLOB, "Team" CLOB, "League" CLOB, "Position" CLOB)

What is the league of the third baseman player before 1973?
SELECT "League" FROM table_49487 WHERE "Year" < '1973' AND "Position" = 'third baseman'
SELECT "League" FROM "table_49487" WHERE "Position" = 'third baseman' AND "Year" < '1973'