Scott Alex <br/><br/>
Ball Clay 

 - 1st.ed 
 - London, UK  Geological Survey Office of London  1929 
 - x,73  ill  24cm 
<br/><br/> Includes index 
<br/><br/>Includes biblography 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Economic Minerals