| Who | What | When | Where | Why | How | |
|---|---|---|---|---|---|---|
| Article One | ||||||
| Article Two | ||||||
| Article Three | ||||||
| Article Four | ||||||
| Article Five |
U.S. Department of the Interior, U.S. Geological Survey
URL: http://pubs.usgs.gov/of/1998/of98-805/lessons/chpt4/act1-hnd.htm
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