Ordnance survey.

1805-1856.
1805 et seq to about 1856.
An index map is enclosed which has been marked to show sheets in the series published to 31 December 1856.
Maps in the NLS collection are, asyet, uncatalogued.
Sheet size is 65.5 x 100.0 approx. (after mounting and dissecting).
Sheets are engraved or printed from electrotypes; some sheets are intended for joining; some sheets in two parts.
The area covered is England & Wales as far north as Lytham to Hull.