DC -- Library of Congress -- Tunnel work:
[1] LOCTUN_170215_05.JPG
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[2] LOCTUN_170215_10.JPG
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[3] LOCTUN_170215_13.JPG
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[4] LOCTUN_170215_17.JPG
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[5] LOCTUN_170215_21.JPG
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[6] LOCTUN_170215_23.JPG
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[7] LOCTUN_170215_27.JPG
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[8] LOCTUN_170215_33.JPG
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[9] LOCTUN_170215_34.JPG
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[10] LOCTUN_170215_42.JPG
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[11] LOCTUN_170215_44.JPG
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[12] LOCTUN_170215_45.JPG
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[13] LOCTUN_170215_50.JPG
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