The herd book of the British Friesian Cattle Society. Vol.61: 1971. Supplementary register : Cows and heifer calves (also polled S.R. bull, cows and heifers); classes A, B, C, D, 435300 to 447979, cla by British Friesian Cattle Society of Great Britain and Ireland. ISBN 0900914130. Published by British Friesian Cattle Society in 1972. Publication and catalogue information, links to buy online and reader comments.