Issue 3

Message from the Chairman
Medical Geology: an emerging discipline 3
The presence of calcium oxalate dihydrate (weddelite) in street sediments from Niteroi, Brazil and its health implications 6
An imperial legacy? An exploration of the environmental impact of ancient metal mining and smelting in southern Jordan 7
Medical Geology at the United States Geological Survey 9
Upcoming conferences 9
New book on Medical Geoogy 10