Arsenic is a naturally occurring element in rocks, soils, and the waters in contact with them. It is found in ground water as the result of minerals dissolving from weathered rocks and soils. This site links to data, maps, and more.
Report on asbestos, six types of mineral fibers belonging to two mineral groups, serpentines and amphiboles,with fiber morphology, crystal structure, analytical methods, properties, mining, milling, uses, and safety factors.(PDF file,28 pp.,4.5 MB)
Fact sheet describing the value of The National Map designed as a network of digital databases that will provide a consistent national geographic data framework in responding to natural hazards and human-induced disasters.