Correlations of the coefficient of the "linear" term in the specific heat, $\ensuremath{\gamma}(0)$, and the discontinuity at ${T}_{c}$, $\ensuremath{\Delta}C({T}_{c})$, with a measured concentration of ${\mathrm{Cu}}^{2+}$ magnetic moments suggest the operation of a pairbreaking mechanism that limits the transition to the superconducting state and produces a contribution to $\ensuremath{\gamma}(0)$. There is no evidence for the existence of an intrinsic contribution to $\ensuremath{\gamma}(0)$. The value of $\ensuremath{\Delta}C({T}_{c})$ for a sample provides a measure of the volume fraction of superconductivity and a basis for correcting measured values of parameters to those characteristic of the fully superconducting state. Estimates of several quantities relevant to the strength of coupling are given.