e; Pl.'.natory note 



The series embcJes r.-.i^ts of investinat.ons, usually oF 

 . vfoH <:rnne in'- "cd to oid or dirccf mar.aae.r.ent or 

 'n-^.tti oro'vics^crid Q. auiJes for Qdmin.s;rct;ve or 

 Ssla ve oSn ir is issued-in limited quor^tities for the 

 S ria use of Federcl, State or cooperating arcnces and m 

 p S ed fo?m for economy and to avoid delay in pubhcction. 



Washington, D. C. 

 January 1951 



