# Letters to Unknown Total letters: 17 ## 1966 - [[letters/1966/660317_unknown|March 17, 1966]] ## 1968 - [[letters/1968/680419_unknown|April 19, 1968]] - [[letters/1968/680823_unknown|August 23, 1968]] ## 1969 - [[letters/1969/690118_unknown|January 18, 1969]] - [[letters/1969/691001_unknown|October 01, 1969]] ## 1970 - [[letters/1970/700121_unknown|January 21, 1970]] - [[letters/1970/700412_unknown|April 12, 1970]] - [[letters/1970/700729_unknown|July 29, 1970]] - [[letters/1970/701214_unknown|December 14, 1970]] ## 1971 - [[letters/1971/710420_unknown|April 20, 1971]] ## 1972 - [[letters/1972/720221_unknown|February 21, 1972]] - [[letters/1972/720415_unknown|April 15, 1972]] - [[letters/1972/720828_unknown|August 28, 1972]] - [[letters/1972/720916_unknown|September 16, 1972]] ## 1974 - [[letters/1974/740421_unknown|April 21, 1974]] - [[letters/1974/740915_unknown|September 15, 1974]] - [[letters/1974/741117_unknown|November 17, 1974]]