TY  - RPRT
TI  - Shatter cones at Sierra Madera, Texas
AU  - Keith A. Howard
AU  - Terry W. Offield
PY  - 1968
DO  - 10.1126/science.162.3850.261
UR  - https://pubs.usgs.gov/publication/70198168
ID  - 70198168
ER  -