Ordnance Survey 1:25,000 First Series Map Sheet SP 62 Marsh Gibbon
Stratton Audley, Fringford, Chetwode, Twyford, Marsh Gibbon, Launton, Edgcott. Ordnance Survey First (Provisional) Series. Infrastructure of Calvert Brickworks marked, with chimneys indicated, but otherwise unidentified.