TY  - BOOK
AU  - Casadevall,Thomas J.
ED  - First International Symposium on Volcanic Ash and Aviation Safety
TI  - First International Symposium on Volcanic Ash and Aviation Safety: program and abstracts : seattle, Washington, July 8-12, 1991 / 
U1  - 629.13 20th ed.
PY  - 1991///].
CY  - [Washington]: 
PB  - [United States Government Printing Office], 
KW  - Volcanic ash, tuff, etc
KW  - Congresses
KW  - Aeronautics
KW  - Safety measures
ER  -