transport constructions tunnels tunneling works 13 underground (transport) 11 history 6 drfting 5 concreting works 4 more ... underground structures 4 postcards 4 pozemní stavitelství 4 building designing 4 silniční stavby 4 railway structures 4 geological survey 3 geoengineering 2 ground structures 2 trhací práce 2 substructure 2 engineering surveying 1 urban underground transport 1 sesuvy půdy 1 roads 1 building supervision 1 tramway transport 1 public-law contracts 1 public competitions 1 real estate development 1 galleries (mining) 1 railway transport 1 iron-concrete constructions 1 less ...