Clearfield published presentations and documents on DocSlides.
PennTec 2014. State College, PA. June 3, 2014. Pr...
The Definition and Causation of Abandoned Mine Dr...
2017. Eric P. Prostko, Ph.D.. Professor and Exten...
002-BURNSIDE BORO003-CHESTER HILL BOROMARY ANNE AL...
Elizabeth Clearfield, Valliammai Muthappan, Xue Wa...
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