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A series of articles in 'Airfix Magazine',1967, revised,expanded and with new material.
OBNB doesn't sell books, but you may be able to find a copy at one of these websites:
The Sherman : an illustrated history of the M4 Medium tank by Peter Chamberlain. ISBN 0853680906. Published by Arms and Armour P in 1968. Publication and catalogue information, links to buy online and reader comments.