Weaver, John C. <br/><br/>
Barley in the united states :   A histortical sketch. 

 - New York-US :   Geografical record,   1943. 
 - páginas 56-73 :   Ilustraciones blanco y negro 
 - Irregular 
 - Vol. XXXIII, no. 1(Jan. 1943) 
 - The Geographical Review ;   no. 1 .
 - The Geographical Review. .