Watson, J. Wreford, <br/><br/>
North America :  its countries and regions / 
by J. Wreford Watson 
 - London :  Longmans,  1968 
 - 881 p. :  ill. ;  22 cm. 
 - Geographies for advanced study .
<br/><br/> bibliography 819-840  Includes index 
<br/><br/><label>Subjects--Topical Terms: </label><br/> Geology--North America