Gregg, Robert E. <br/><br/>
The ants of Colorado; with reference to their ecology, taxonomy, and geographic distribution 

 - Boulder :  Univ. of Colorado,  1963 
 - 792 p.  : ilus 
<br/><br/><label>LCCN: </label>15250 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Hormigas.
<br/><br/><label>Dewey Class. No.: </label>595.796  / G7