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Metals.
| N (%) | |
|---|---|
| Lead | 37 (29.8) |
| Iron | 20 (16.1) |
| Cobalt | 15 (12.1) |
| Mercury | 15 (12.1) |
| Arsenic | 7 (5.6) |
| Chromium | 7 (5.6) |
| Gadolinium | 5 (4.0) |
| Miscellaneousa | 18 (14.5) |
| Class total | 124 (100) |
aIncludes magnesium, thallium, metal unspecified, cadmium, barium, zinc metal, aluminum, nickel, selenium, antimony, and copper
