LBJ EXPRESSES APPRECIATION OF ANDERSEN; ANDERSEN THANKS LBJ FOR VISITING CHARLES MARSH, EXPRESSES SUPPORT FOR LBJ, SAYS LBJ WILL CARRY FLORIDA; LBJ ASKS FOR COPY OF ANDERSEN'S NEWSPAPER, SAYS HE WILL SEND HIM COPY OF HOUSTON HARTE'S STORY ON LBJ'S BOYHOOD