Check out these dowsing links:
American Society of Dowsers - for information about dowsing, upcoming conferences and other resources
Letter to Robin - was written by Walt Woods in response to a letter from Robin asking basic dowsing questions.
This has become a basic handbook with teaching manual and is an excellent place for anyone to begin their dowsing journey.
Dowsers Canada - has great links to many other organizations
Dowsingworks.com - has many links helpful to the novice and experienced dowser.
This is the site of ISD - International Society of Dowsers
Joey Korn at dowsers.com - for professional dowsing and training