1: 25,000 First Series

We still have a few maps in this series, usually paper folded.
Please ask for specific sheets or areas, having read the notes below on sheet numbers.

About the series
The 1:25,000 First Series sheets usually cover 10 by 10km with publication having begun in 1945. As a snapshot of the landscape when issued, most sheets fail completely, as they were compiled from the latest six-inch mapping, a lot of which dated from before 1914. But for many people, this is one of the strengths of the series, in that they show features long vanished and for which it is hard to find larger scale, more detailed maps. Railways, canals and pre-war road systems are shown in detail, as is the rural landscape. Field boundaries, parish boundaries and footpaths are shown. The series was finally ended in 1989, when the Second Series (Pathfinder) was completed.

A full history and carto-bibliography of the series can be found in A guide to the Ordnance Survey 1: 25,000 First Series.

How to find a number for the sheet you want
We use a 1980s road atlas as a useful and detailed index to this series (and the Second Series (Pathfinder)).
Look in the front of any road atlas, and if it mentions using the National Grid, then one small square on the page is one 1:25,000 First Series map.The maps are numbered using two letters, followed by two digits. Consider Haywards Heath, just north of Brighton. Somewhere on the page will be two large letters TQ.
Haywards Heath is in the centre of a square, and the map is TQ 32. The 3 is the digit for the vertical line forming the left edge of the square, and can be seen at the top and bottom of the line, on the edge of the page. The 2 is the digit for the horizontal line forming the bottom edge of the map, and can be seen on the left and right of the atlas pages.
If you already own a map from this series, compare it to a road atlas and things usually become clear.

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