Cite

Ordnance Survey of England / engraved and published at the Ordnance Survey Office.

MLA

Survey, Great Britain. Ordnance. Ordnance Survey of England / Engraved and Published at the Ordnance Survey Office. Ordnance Survey, 0AD. https://collections.library.yale.edu/catalog/15309108.

APA, 6th edition

Survey, G. B. O. (0 C.E.). Ordnance Survey of England / engraved and published at the Ordnance Survey Office. [Maps]. Ordnance Survey, https://collections.library.yale.edu/catalog/15309108.