I want to know what the extinction coefficients of oxymyoglobin and ferryl myoglobin are. I was able to find the one for the oxymyoglobin in this pretty old article (it says that it equals $121 \text{mM}^{-1}\text{cm}^{-1}$), but I couldn't locate any other reference supporting this claim. Furthermore, I couldn't find any reference in the case of ferryl myoglobin.
I am also curious if, in general, there are tables containing the extinction coeffcients of various compounds (at different wavelengths).