5.23—Contents of notices.
        
        (a) 
         Each notice of proposed rulemaking is published in the Federal Register, unless all persons subject to it are named and are personally served with a copy of it.
    
    
    
    
    
        
        (3) 
         A description of the subjects or issues involved or the substance or terms of the proposed rule;
    
    
        
        (4) 
         A statement of the time within which written comments must be submitted and the required number of copies; and