# Cover Front Thb Cover Back Thb Postmark Year Postmark Month Postmark Day Postmark City Postmark State Mailed To State Actions
501 1936 6 8 Boulder CO CO
502 1955 2 16 Boulder CO UT
503 1951 12 19 Boulder CO
504 1948 8 20 Boulder CO
505 1925 12 14 Berthoud CO CO
506 1901 3 25 Bailey CO CO
507 1942 3 9 Aurora CO CO
508 1935 3 4 Aspen CO CO
509 1908 11 30 Aspen CO CO
510 1888 8 25 Aspen CO