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Full text available from Earth, Atmospheric & Aquatic Science Database: 03/01/1997 to 12/31/1998Full text available from Environmental Science Database: 03/01/1997 to 12/31/1998
Full text available from Science Database: 03/01/1997 to 12/31/1998
Full text available from Earth, Atmospheric & Aquatic Science Database: 01/01/2003 to present
Full text available from Environmental Science Database: 01/01/2003 to present
Full text available from Science Database: 01/01/2003 to present
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