In the back of Dr. Rapp's other book "Is This Your Child's World", there are many, many references. Not just for in the US but other countries too. There's references for doctors (or places to get referals) , products, testing and much more. There is a number for the American Academy of Environmental Medicine in Kansas. (913-642-6062) It says that "they can provide the name of the nearest EI specialist". Maybe that would be a place to start. I called and they gave me a number for a Dr. about 1 1/2 hours from my home. I think I'd rather travel that far than hop around from dr. to dr. in my area trying to find the right one. I'll let you know what happens. Heidi :)