Prior to NUMBER@1 , when the LOCATION@1 Secretary of ORGANIZATION@1 approved the two-letter codes for use in government documents , ORGANIZATION@2 NUMBER@2 , May NUMBER@3 , NUMBER@1 -LSB- -RSB- Accessed April NUMBER@4 , NUMBER@5 .

In NUMBER@1 , the Secretary of ORGANIZATION@1 switched to the two-letter State Alpha Code for state abbreviations .
