First International Symposium on Volcanic Ash and Aviation Safety :  program and abstracts : seattle, Washington, July 8-12, 1991 /  
edited by Thomas J. Casadevall. 
 - [Washington]:   [United States Government Printing Office],   [1991].  
 - iv, 58 p. :  ill., tables ;  28 cm. 
 -  1065 .
<br/><br/><label>Subjects--Topical Terms: </label><br/>Volcanic ash, tuff, etc--Congresses<br/>Aeronautics--Safety measures--Congresses
<br/><br/><label>Dewey Class. No.: </label>629.13