"Safety of manriding in shafts and unwalkable outlets, Report." 

 -  1976 
<br/><br/><label>Standard No.: </label>189168 
<br/><br/><label>Source: </label> Reference Collections 
<br/><br/><label>Dewey Class. No.: </label>"X9(HZ):94.3,N73t, L6/GD"