Spencer Ellam, A. <br/><br/>
Cornish tin and copper mining of the past; and future prospects. 

 - London-GB :   Tin & copper world,   1913. 
 - páginas 9-10 
 - Irregular 
 - No.61 (May. 1913) 
 - Tin & copper world with oil supplement ;   no.61 .
 - Tin & copper world. .