Humphrey, Grace  (1882-post 1951). <br/><br/>
Poland the unexplored / 
by Grace Humphrey. 
 - 1 ed. 
 - Indianapolis :  The Bobbs-Merrill,  cop. 1931 
 - 332 s., 12 tabl. :  il. ;  23 cm. 
<br/><br/> BP 1901-1939  t. 12 poz. 87964.