File:Arnold (1913) pg 233 - Contour study of tunnel alignment.jpg
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![File:Arnold (1913) pg 233 - Contour study of tunnel alignment.jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/2/27/Arnold_%281913%29_pg_233_-_Contour_study_of_tunnel_alignment.jpg/370px-Arnold_%281913%29_pg_233_-_Contour_study_of_tunnel_alignment.jpg?20180727143754)
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