Physical Geography of Somerset
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452River Avon Trail, ' Avon Gorge http://www.riveravontrail.org.uk/
avongorgewildlife.html'. Accessed 2006-05-05. 455“Geology” http://www.
avongorge.org.uk/wildlife.php?ContentID=11. Avon Gorge and Downs. Retrieved
2008-09-11. 454C.