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Material contained herein is extracted from printed reports copyrighted 1993-2001 by Loyola College in Maryland and copyrighted 2002 by WTEC Inc. It is based on studies sponsored by the National Science Foundation and other agencies of the United States Government under a series of NSF grants and cooperative agreements with Loyola College in Maryland. As such, the U.S. Government retains a nonexclusive and nontransferable license to exercise all exclusive rights provided by copyright. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the authors and do not necessarily reflect the views of the United States Government, the authors' parent institutions, Loyola College or WTEC Inc.
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