If you get a chance to read 'Dowsing Today' – The Journal of the British Society of Dowsers (Volume 41, NO 296, June 2007), on page 6 there is an interview with Sue Holmes, professional dowser! It includes a description of the earth healing that I took part in when we stayed with the San Bush people of the Kalahari in August 2006.
To order a copy, contact the British Society of Dowsers on 01684 576969, or email info [at] britishdowsers [dot] org