Proceed to the posted coordinates and enter the post office.
To obtain the last three digits for NORTH (N 34° 22._ _ _ ), simply follow these instructions: Beginning with post office box 306, count to your right to the 5th box. Then beginning with that box, count down to your 5th box. Use that box number as the numbers needed for NORTH digits.
To obtain the last two digits for WEST (W 088° 42.0 _ _ ), simply follow these instructions: Beginning with post office box 3, count to your right to the 3rd box. Then beginning with that box, count down to your 7th box. Use that box number as the numbers needed for WEST digits.