File:QI-4th-prewar revision code.PNG

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Description:	Guide to the location and style of the revision codes of pre-war OS Quarter Inch Fourth Series mapping. In this example, the revision code is '60/37 M.36 R.30-2', meaning this particular map was published in 1937.
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	Galleries \| SABRE Maps \| OS Quarter Inch

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	Date/Time	Thumbnail	Dimensions	User	Comment
current	16:32, 2 December 2020		648 × 500 (500 KB)	Steven (talk \| contribs)	Guide to the location and style of the revision codes of pre-war OS Quarter Inch Fourth Series mapping. In this example, the revision code is "60/37 M.36 R.30-2", meaning this particular map was published in 1937.

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