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Graticular Blocks (WA)

A graticular block is one minute of latitude by 1 minute of longitude. This is called a sub-block outside of WA.

The National 1:1Million mapping series is broken into 5min x 5min blocks, which are numbered 1-3456, and then divided into 25 1min x 1min sub-blocks with the letters a to z,z, excluding i.i.

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