Tilling, Robert I. <br/><br/>
Eruptios of Mount St. Helens :  Past, present, and future / 
By Robert I. Tilling. 
 - Washington :  Government Printing,  1987. 
 - 46 p. :  ill. ;  22 cm. 
 - 622.2 (NLA) .
<br/><br/><label>Subjects--Topical Terms: </label><br/>Eruptio
<br/><br/><label>Universal Decimal Class. No.: </label>622.2 (NLA)