Ok... this isnt quite East Dulwich but much of the surrounding locale is covered...As Im from East Dulwich here's a bit of shameless self publicity for my new book London?s Lost Rivers (Random House Books), which will be of interest to people in East Dulwich as it contains a chapter on the River Effra (Upper Norwood to Vauxhall via Belair Park) and Earl's Sluice (Ruskin Park to Rotherhithe) plus the Grand Surrey Canal in (Peckham & Camberwell) . Overall the "lost" waterways in the book covers the history & routes of 22 rivers,8 canals & 8 docks with maps & over 100 modern day photos.A sample chapter can be found on www.londonslostrivers.com The book covers many other SE London such as the Surrey Commercial Docks,the Rotherhithe Mill Streams, River Peck, River Neckinger, Croydon Canal & Deptford Dockyard.To promote the book Im giving a few guided walks including: Sat 28 May ? Grand Surrey Canal Guided Walk (from Peckham to Rotherhithe). see the website if interested. Cheers Paul Talling