Mirsky, Jeannette,  1903-1987 <br/><br/>
The westward crossings :  Balboa, Mackenzie, Lewis and Clark / 
by Jeannette Mirsky. 
 - 1st ed. 
 - New York :  Alfred A. Knopf,  1946. 
 - xv, 365, xiii p. :  ill., maps (1 fold.) ports. ;  22 cm. 
<br/><br/>Includes bibliographical references and index 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Explorers--North America
<br/><br/><label>Subjects--Geographic Terms: </label><br/>America--Discovery and exploration<br/>North America--Description and travel