Northern Sump Index 2015
If you want to dive the classic sites of the North of England, and especially if you have any ambition in the field of exploration; then this book is invaluable.
Complete with detailed individual site descriptions, references to CDG newsletters so that the researcher can see a blow-by-blow account of exploration, and many surveys, this Sump Index is the result of a very impressive team effort carried out over several years by volunteers. They must be congratulated on such a marvellous product of their labours.
Soft cover with colour photograph.