Surface formation rates and impact crater densities on Venus Surface formation rates and impact crater densities on Venusv. 10421,951–21,955Campbell, Bruce A. 1999. "Surface formation rates and impact crater densities on Venus." Journal of Geophysical Research. E. Planets, 104, (E9) 21,951–21,955.More...ID: 71480Type: articleKeywords: NASM; NASM-CEPS