If two pill names are given for a single sample, all elements besides Ir were measured on the pills indicated in the second column. Exceptions occurred for Samples 26, 29, 31, and 35. The indicated errors are the estimated precisions of measurement; i.e., essentially the standard deviations in the counting of gamma rays following activation by neutron irradiation. Because of uncertainties in interference corrections, all precisions are at least 1%, although counting errors for some elements are smaller. The accuracies of the measurements are comparable to the precisions except when flux monitors were used for calibration. Empty cells indicate that the element was not measured in that sample.