Based on the 1967 steam tables published by the Electrical Research Association.
UK steam tables in SI units, 1970 : thermodynamic properties of water and steam, viscosity of water and steam, thermal conductivity of water and steam, graphs for boiler feed pump calculations by United Kingdom Committee on The Properties of Steam. ISBN 0713132396. Published by Edward Arnold in 1970. Publication and catalogue information, links to buy online and reader comments.