TY - RPRT TI - Probabilities of non-penetration and targets downed for constant characteristic kill probability : semi-annual progress report on MIPR 55-2175-SC-91 July 1 to December 31, 1955 PY - 1956 PB - National Bureau of Standards CY - Gaithersburg, MD SN - NBS report ; 4571 DO - 10.6028/NBS.RPT.4571 ER -