EPSG
G. Bomford "Geodesy" 2nd edition 1962; after J.S.Clark "Remeasurement of the Old Length Standards"; Empire Survey Review no. 90; 1953.
2015-11-25
Uses Sear's 1922 British yard-metre ratio as given by Bomford as 39.370147 inches per metre. Used in East Malaysian and older New Zealand mapping.