The herd book of the British Friesian Cattle Society. Vol.58: 1968. Supplementary register, Cows and heifer calves (also polled S.R. cows and heifers); classes A, B, C, D, 397,000 to 409,139, classes by British Friesian Cattle Society of Great Britain and Ireland. ISBN 0900914041. Published by British Friesian Cattle Society in 1969. Publication and catalogue information, links to buy online and reader comments.