Ellis, Erl H., <br/><br/>
International boundary lines across Colorado and Wyoming :  a lesson in geography / 
Erl H. Ellis. 
 - edition limited to 500 numbered and signed copies of which this is no. 0422. 
 - 47 pages :  maps.: 
<br/><br/><label>LCCN: </label>66026781  
<br/><br/><label>Subjects--Geographic Terms: </label><br/>Colorado history--international boundary lines.