Jeremiah Curtin 
Mongols in Russia [PDF ebook] 

Whilst the greatest effort has been made to ensure the quality of this text, due to the historical nature of this content, in some rare cases there may be minor issues with legibility. The Mongols retreated from all lands west of the Carpathians and confined themselves exclusively to that part Of Europe which we know as Russia. The West was too narrow for them, too mountainous, too much diversified, and contained too little pastoral land. It had too much culture, and differed too greatly from that immense open region which stretches from the Dnieper, or more correctly from the Danube, to that vast ocean of water which was later called the Pacific.