Source record

Zhen Leng and Imad L. Al-Qadi, “Railroad Ballast Evaluation Using Ground-Penetrating Radar,” Transportation Research Record 2159 (2010): 110-117.

Method
Literature

Zhen Leng and Imad L. Al-Qadi, “Railroad Ballast Evaluation Using Ground-Penetrating Radar,” Transportation Research Record 2159 (2010): 110-117.

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