The development of clay building materials industries in developing countries :  report of the Interregional Seminar on Clay Building Materials Industries, Copenhagen, 12-25 August 1968. 

 - [New York] :  United Nations,  [1969] 
 - [Document - United Nations] ; ID/28, (ID/WG.16/8) .
<br/><br/> "United Nations publications. Sales no. E.69.II.B.18."  At head of title: United National Industrial Development Organization, Vienna. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Clay industries -- Congresses.--Clay industries -- Congresses.<br/>Building materials.<br/>Industries -- Developing countries.--Industries -- Developing countries.
<br/><br/><label>Subjects--Geographic Terms: </label><br/>Developing countries -- Clay industries -- Congresses.--Developing countries -- Clay industries -- Congresses.--Developing countries -- Clay industries -- Congresses.