SCHEMA:
CREATE TABLE table_name_41 (area__km_2__ INTEGER, rank VARCHAR, location VARCHAR, population__2000_ VARCHAR)
USER:
What is the largest area in Alaska with a population of 39 and rank over 19?

QUERY:
SELECT MAX(area__km_2__) FROM table_name_41 WHERE location = "alaska" AND population__2000_ = "39" AND rank > 19