EXPLANATORY NOTE 



The series embodes results of investigations, usually of 

 restricted scope, in'e,:.Vd to aid or direct manogeir.ent or 

 utilization practices : ' " -'-'ides for administrative or 

 legislative action. It i limited quantities for the 



official use of Federal, 1.^:.^ l: cooperating agencies and in 

 rrccessed fcrrn for eccnorr;'/ and to avoid delay in publiccticn. 



Washington, p. C. 



Jo;ii'" ' 



