Tschudy, Robert H. <br/><br/>
Normapolles pollen from the Mississippi embayment 

 - Washington, D.C.  U.S. Geological Survey  1975 
 - pp. 1-42  láms. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>CRETACEO<br/>POLEN Y ESPORAS<br/>TERCIARIO
<br/><br/><label>Subjects--Geographic Terms: </label><br/>ESTADOS UNIDOS