TY  - RPRT
TI  - Catalog of first motion focal mechanisms 1984-1985 : Volume 1
AU  - R.E. Needham
PY  - 1988
DO  - 10.3133/ofr86520a
UR  - https://pubs.usgs.gov/publication/ofr86520A
ID  - ofr86520A
ER  -