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Infinite GridSM Level 4, or IG-4, based on 8x8
7'30" x 3'45" grid cells.
Clicking on one of these grid cells links to a more detailed map of that
specific area. From here one can link to a set of nine grid cells, which
can be used to navigate across the globe, or to a list of all references
in this book for this specicific area.
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