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41by Journey, Celeste A.“...U.S. Geological Survey ;...”
Published 1997
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42by Kidd, Robert E.“...U.S. Geological Survey ;...”
Published 1997
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43by Mayer, Gregory C.“...U.S. Geological Survey ;...”
Published 1997
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44Published 1996“...U.S. Geological Survey,...”
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45
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46by Robinson, J. B. (J. Ben)“...U.S. Geological Survey ;...”
Published 1998
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47by Brown, Larry R.“...U.S. Geological Survey,...”
Published 1998
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48Published 1998“...U.S. Geological Survey,...”
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49Published 1998“...U.S. Geological Survey,...”
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50Published 1998“...U.S. Geological Survey :...”
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51
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52
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53Published 1997“...U.S. Geological Survey :...”
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54
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55
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56by Richter, Donald H.“...U.S. Geological Survey,...”
Published 1997
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57by Willard, Debra A.“...U.S. Geological Survey,...”
Published 1997
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58by Weems, R. E. (Robert E.)“...U.S. Geological Survey ;...”
Published 1997
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59by Hickman, R. Edward“...U.S. Geological Survey ;...”
Published 1999
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60