Contents: Hypervelocity cratering data and a crater-depth model for the regime of fluidity, Fluid impact craters and hypervelocity -high-velocity impact experiments in metals and rocks, Energy balances in hypervelocity penetration, The partition of energy for hypervelocity impact craters formed in rock, Transient observations of crater formation in semi-infinite targets, Influence of target strength of hypervelocity crater formation in aluminum, Some phenomena associated with impacts into aluminum, Particle-solid impact phenomena, Investigation of the impact of copper filaments into aluminum targets at velocities to 16,000 feet per second, Ionization associated with hypervelocity impact, Investigation of impact flash at low ambient pressures, An investigation of the phenomena of impact flash and its potential use as a hit detection and target discrimination technique, Summary of theoretical and experimental studies of crater formation.