TY - RPRT TI - Ultrasonic borehole televiewer investigation of oceanic crustal layer 2A, Costa Rice Rift AU - Mark D. Zoback AU - R.N. Anderson PY - 1982 DO - 10.1038/295375a0 UR - https://pubs.usgs.gov/publication/70011630 ID - 70011630 ER -