Fourth Edition, with the National Grid (Published 1946, with later revisions)
Fourth Edition, with the National Grid : Home page
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Published 1946 on 7 sheets (8 and 9 combined) with subsequent revisions and reprints.
Quarter-inch Fourth Edition, with the National Grid, Scotland : Sheets 1- 9
Print codes used
These are found in the lower left corner of each sheet. They were originally numbers, whilst later codes consist of a letter, with or without bars underneath. The bars indicate significant changes. On this website Edition letters are shown as A/, instead of A.
Cover codes
The standard cover is a long blue wavy design on buff card (code SC).
