TY  - BOOK
AU  - Ewert,John W.
AU  - Swanson,Donald A.
ED  - United States
TI  - Monitoring volcanoes: techniques and strategies used by the staff of the Cascades Volcano Observatory, 1980-90 / 
U1  - 551.21072073 20th ed.
PY  - 1992///].
CY  - [Washington]: 
PB  - [United States Government Printing Office], 
KW  - Volcanism
KW  - Research
KW  - Methodology
KW  - United States
N1  - Includes bibliographical references (p. 222-223)
ER  -