found: Work cat.: Pepper, J. Cockley Beck, 2006:back cover (Cockley Beck at the head of Lakeland's remote Duddon Valley)
found: Wikipedia, Nov. 9, 2007(Duddon Valley; a valley in the Lake District National Park in Cumbria, England; the River Duddon flows through the valley)
found: The Cumbria Directory web site, Nov. 9, 2007(Duddon Valley (Dunnerdale) begins on the road between Hardknott Pass and Wrynose Pass at Cockley Beck and leads south to Duddon Bridge in south Lakeland)
notfound: GeoNet, Nov. 28, 2007
