File:5th revision code - early.JPG
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|current||18:20, 6 August 2020||678 × 609 (72 KB)||Steven||Guide to the location and style of the revision codes of the earliest OS One Inch Fifth mapping. In this example, the revision code is '9200/31', which indicates that there were 9200 copies of this map, and it was published in 1931. Occasionally later revision codes were tacked onto the end, and it is the righthand most code that is the most important.|