TY - RPRT TI - U.S.-Soviet Collaborative Geological and Geophysical Survey of the Mid-Atlantic Ridge near 31 degrees N, the Petrov Fracture Zone AU - Kim D. Klitgord AU - Leonard V. Dmitriev AU - John F. Casey AU - Sergei Silantiev AU - Kevin Johnson PY - 1993 DO - 10.3133/ofr1994007 UR - https://pubs.usgs.gov/publication/ofr1994007 ID - ofr1994007 ER -