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Selig, E.T., Olhoeft, G.R., J.P. and Smith, S., Ground penetrating radar for track substructure condition assessment: IHHA/REMSA World Rail Expo., May 2003, Dallas-Ft.Worth TX, 6p., in press, 2003.
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Assessment of railway track substructure condition using ground penetrating radar: AREMA, 5-7 Oct. 2003, Chicago
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