TY  - RPRT
TI  - Catalog of first motion focal mechanisms 1981-1983; Volume 1
AU  - R.E. Needham
PY  - 1986
DO  - 10.3133/ofr86285a
UR  - https://pubs.usgs.gov/publication/ofr86285A
ID  - ofr86285A
ER  -