Jansa, Lubomir F. <br/><br/>
Comets and extinctions: cause and effect? 

 - Boulder, CO  Geological Society of America  1990 
 - pp. 223-232  ilus. 
 - Special Paper. Geological Society of America  n.247 .
<br/><br/><label>Subjects--Topical Terms: </label><br/>CATASTROFES<br/>COMETAS<br/>EXTINCION MASIVA
<br/><br/><label>Subjects--Geographic Terms: </label><br/>CANADA<br/>NOVA SCOTIA
<br/><br/><label>Universal Decimal Class. No.: </label>56.017.4/S47|14