Mayo, R. S. (1968). Tunneling the state of the art: A review and evaluation of current tunneling techniques and costs, with emphasis on their application to urban rapid-transit systems in the U.S.A. Springfield, VA: Clearinghouse.
Παραπομπή Chicago StyleMayo, Robert S. Tunneling the State of the Art: A Review and Evaluation of Current Tunneling Techniques and Costs, With Emphasis On Their Application to Urban Rapid-transit Systems in the U.S.A. Springfield, VA: Clearinghouse, 1968.
Παραπομπή MLAMayo, Robert S. Tunneling the State of the Art: A Review and Evaluation of Current Tunneling Techniques and Costs, With Emphasis On Their Application to Urban Rapid-transit Systems in the U.S.A. Springfield, VA: Clearinghouse, 1968.
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