National Research Council (U.S.) text Washington, D.C National Academy of Sciences 1982 [i.e. 1983] monographic iv, 21 p. : ill. ; 28 cm. Transportation Research Board, National Research Council. 0 0 0 624_193000000000000_TUN Tunnels Lighting Tunnels Ventilation Tunnels 624.193 TUN 0309034701 (pbk.)