┆In complete National Grid series of 1:2500 scale maps of Herefordshire to be used in conjunction with the key map covering the whole county. You will need to order his item from the strongroom (reference CJ92).
To locate the reference to a relevant quadrant, follow its left hand border down to the number on the lower margin of the key map or up to the same number on the upper margin of the key map. Then follow its lower border to the number on the left hand margin of the key map or the same number on the right hand margin of the key map. The relevant coordinate number will have four digits, the first two being from the upper or lower margin of the key map and the second two from the left or right hand margin of the key map.
The first, earlier, series of maps is presented in double quadrants, i.e. two squares on the key map running from left to right or west to east \[1972-1977\]. The second, later series of maps is presented in single quadrants \[1994-1998\].
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