Gregory, J.W. <br/><br/>
A brief review of the evidence upon which the theory of isostasy has been based. 

 - London-GB :   The royal geographical society,   1920. 
 - páginas 47-59 :   Ilustraciones blanco y negro 
 - Irregular 
 - Vol.LVI, no.I (Jul.1920) 
 - The geographical journal ;   no.I .
 - The royal geographical society. .