The specific heats, C, of 5 samples of La1.85M0.15CuO4-y (M=Ca, Sr, Ba), one sample of La2CuO4-y, and one sample of YBa2Cu3O9-y have been measured between 0.4 and 40K, in magnetic fields, H, to 7T. For the La1.85M0.15CuO4-y samples the H dependence of C near Tc and near 1K, where C is dominated by the electronic contribution gives information about the fraction of the sample that is a bulk superconductor and the density of electronic states. The fraction of bulk superconductivity indicated by the Meissner effect does not correlate well with that indicated by C. La2CuO4-y has a linear term in C, in qualitative agreement with a theoretical prediction [1].