...welfare of the miners and for the prevention of undue waste as may be prescribed by said Secretary shall be observed, including a restriction of the...emergency; provisions prohibiting the employment of any child under the age of sixteen in any mine below the surface; provisions securing the workmen complete...

...Secretary of the Interior. Provision shall also be made restricting the workday to not more than 8 hours in any one day for underground workers, except in cases of emergency; prohibiting the employment of any boy under the age of 16, or the employment of any girl or woman,...

...prevent damage to mineral deposits, injury to life, health, or property, or economic waste; to restrict the workday to not exceeding eight hours in any one...underground workers, except in cases of emergency; to employ no boy under the age of sixteen and no girl or woman, without regard to age, in any mine...

...prevent damage to mineral deposits, injury to life, health, or properly, or economic waste; to restrict the workday to not exceeding eight hours in any one...underground workers, except in cases of emergency; to employ no boy under the age of sixteen and no girl or woman, without regard to age, in any mine...

...prevent damage to mineral deposits, injury to life, health, or property, or economic waste; to restrict the workday to not exceeding eight hours in any one...underground workers, except in cases of emergency; to employ no boy under the age of sixteen and no girl or woman, without regard to age. in any mine...

...prevention of undue waste as may be prescribed by the Secretary; prohibiting a workday in excess of eight hours in any one day for underground workers except in cases of emergency; prohibiting the employment of any boy under the age of sixteen or the employment of any girl or woman,...

...underground workers, except in cases of emergency; to employ no boy under the age of sixteen and no girl or woman, without regard to age, in any mine below the surface; to observe all laws relative to the health and safety of workmen and employees; and to provide access...

...welfare of the miners and for the prevention of undue waste as may be prescribed by snid Secretary shall be observed, including a restriction of the...boy under the age of sixteen or the employment of auy girl or woman, without regard to age, in any mine below the surface; provisions securing the workmen...

...welfare of the miners and for the prevention of undue waste as may be, prescribed by said Secretary shall be observed, including a restriction of the...provisions prohibiting the employment of any boy under the a<re of sixteen or the employment of any girl or woman, without regard to age, in any mine below the...

...welfare of the miners and for the prevention of undue waste as may be prescribed by said Secretary snail be observed, including a restriction of the workday...provisions prohibiting the employment of any boy under the a<re of sixteen or the employment of any girl or woman, without regard to age, in any mine below the...