File:18 Apr 1962 Cheyenne Mt, Int const, tunnel work.jpg
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![File:18 Apr 1962 Cheyenne Mt, Int const, tunnel work.jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/6/6d/18_Apr_1962_Cheyenne_Mt%2C_Int_const%2C_tunnel_work.jpg/751px-18_Apr_1962_Cheyenne_Mt%2C_Int_const%2C_tunnel_work.jpg?20100711042725)
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