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What Are the Following? the Black Vertical Line Between Eastings 09 and 10 - Geography

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Question

What are the following?

The black vertical line between eastings 09 and 10

Solution

It is a longitude.

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Topographic or Ordnance Survey Maps
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2013-2014 (March)

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R. F. 1: 50,000
Part of the Topographical Sheet No 63K/12


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