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"Walks 1-23 first published in London countryside walks for motorists: north western area, 1975; walks 25-29 first published in London countryside walks for motorists: north eastern area. 1977”.
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Hertfordshire : walks for motorists by Wm. A. Bagley. ISBN 0723228094. Published by Warne in 1982. Publication and catalogue information, links to buy online and reader comments.