Wardlaw, Bruce R.; Grant, Richard E.; Rohr, David M. <br/><br/>
The Guadalupian symposium / 
Bruce R Wardlaw; Richard E Grant; David M Rohr. 
 - Smithsonian contributions to earth sciences, 32 
 - Washington, D.C. :   Smithsonian Institution Press,   2000. 
<br/><br/><label>Universal Decimal Class. No.: </label>56