Sagan, C <br/><br/>
The search for extraterrestrial life.  [electronic resource] 

 -  Scientific American  Oct 1994 
 - 92-9 p.  digital 
<br/><br/> Publication Type: Journal Article; Review 
<br/><br/><label>ISSN: </label>0036-8733 
<br/><br/><label>Standard No.: </label>10.1038/scientificamerican1094-92  doi 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Atmosphere--analysis<br/>Earth, Planet<br/>Evolution, Chemical<br/>Evolution, Planetary<br/>Exobiology<br/>Extraterrestrial Environment<br/>Life<br/>Mars<br/>Meteoroids<br/>Minor Planets<br/>Saturn<br/>Solar System<br/>Space Flight<br/>Spacecraft