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Are you talking about......
Are you talking about the 1:24,000 standard USGS maps?
They have the grid tick marks around the edge. Get a 36" ruler and draw your own grid lines on the map. Just be careful to draw to the right ticks and in numbering them.
Above 1:50,000 those grid boxes start looking mighty small which is why the others use lat long.
When we were in the desert using 1:250,000 maps all we used was lat long.
Pays to be able to go either way.
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