00482nam a2200133Ia 4500008004100000040001700041082002200058110004100080245012400121260002200245300001400267500002900281650003800310190328s9999||||xx |||||||||||||| ||und||  aNITILcNITIL  221sta331.8bI61P  aInternational Labour Office (Geneva) 4aThe Protection of young workers employed underground in coal minesbinternational labour conference, 35th session, 1952  aGenevabILOc1951  aiv, 112p.  aNinth item on the agenda  aCoal mines and mining; Employment