Information services on research in progress : a world wide inventory 
ed. by the Smithsonian Science Information Exchange,Inc. and comp. with the support of UNESCO with in its General Information Programme and UNISIST 
 - 2a edición 
 - 320 páginas 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Investigación--Servicios de información--Directorios.
<br/><br/><label>LC Class. No.: </label>Q179 .96  / I55 1982