https://www.google.com/url?sa=t&source=web&rct=j&url=http://sp5kf.pl/uploads/Zwiezly-podrecznik-telegrafii-SP8QED.pdf&ved=2ahUKEwjh3oDpyr39AhWYlf0HHdnCBZUQFnoECA8QAQ&usg=AOvVaw3CorjwJUh443TdY7BGSth9
433.500,145.550,70.260,439.550 Janusz, Barlinek JO72ox