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'The sixth symposium organised for the British Egg Marketing Board by its Scientific Advisory Committee ... held at Harper Adams Agricultural College, Edgmond, Newport, Shropshire on 17th to 19th September 1969.' - preface.
OBNB doesn't sell books, but you may be able to find a copy at one of these websites:
Factors affecting egg grading. ISBN 0902727001. Published by British Poultry Science Ltd in 1970. Publication and catalogue information, links to buy online and reader comments.