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Brockhaus-1837: Tunnel
Brockhaus-1911: Tunnel
DamenConvLex-1834: Tunnel
Herder-1854: Tunnel
Lueger-1904: Tunnel [3] · Tunnel [2] · Tunnel [1]
Meyers-1905: Tunnel
Pierer-1857: Tunnel
Roell-1912: Nerthe-Tunnel · Mont d'Or-Tunnel · St. Clair-Tunnel · Rogers Pass Tunnel · Mont Cenis-Tunnel · Col di Tenda Tunnel · Ärmelkanal-Tunnel · Gattico-Tunnel · Elm-Tunnel