Abstract : Shot Lacrosse afforded an opportunity to instrument a medium yield (37.8 kt) surface burst. Ground surface air-blast gages recorded a precursor type shock wave at a station 1,180 feet from ground zero and a clean or classical type wave at a station 1.950 feet from ground zero. Cor relation of air-blast data with Projects 1.2 and 30.2 of Sandia Corporation electronically recorded blast measurements was excellent. Shot Cherokee was a high yield (3.8 Mt) air burst. A difference in the overpressure and wave shape was noted on records obtained from the man-made islands and those obtained from the reef stations east of Site Charlie. Scaled models of these stations were fired on in the BRL shock tube and, based on these experiments, the difference in wave shape and 20 percent or more degradation in pressure may be attributed to the type gage mount used for the reef stations. Shot Zuni was the first high yield (3.35 Mt) surface burst that afforded a land-surface blast line from ground zero to the gages. Two blast lines, approximately 180 degrees apart, were instrumented for this shot. (Author)