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Classic tractors of the World by Nick Baldwin. Published by Voyager Press. ISBN 0-89658-394-5
A Comprehensive A-Z of tractor manufactures may of whom have disappeared or merged and never really sold to the UK market.
Full of great full colour photographs and examples of old adverts from the time of manufacture. A lot are photos of beautifully restored examples but others are in the rough , or archive photos in B&W.
Web site http://www.voyagerpress.com