Africa :   On the spot. 

 - London-CA :   British farm mechanization,   1950. 
 - páginas 6-7 :   ilustraciones blanco y negro 
 - Irregular 
 - Vol. 2, no.10 (Jan.1950) 
 - British farm mechanization. A link between British engineering and world farming ;   no.10 .
 - British farm mechanization. .