My students and post-docs have made measurements of the conduction electron spin magnetization density, Mσ(R↘) near iron group atoms (Sc through Ni) in Cu. Mσ(R↘) produces an additional effective local field which shifts the NMR frequency of nearby shells of Cu nuclei relative to Cu nuclei far from all impurities. Resonances of nearby shells appear as weak satellites to the strong resonance of distant Cu nuclei (the main line). Mσ(R↘) at a given site is proportional through known constants to the splitting of the satellite from the main line. We have identified the shell giving rise to the satellite in many cases by use of single crystals. We find theoretically that to a good approximation Mσ(R↘) is proportional to the spin susceptibility χs of the impurity. For CuCr we find a large temperature independent χs, in contrast to CuMn and CuFe. The results lead to a picture of the electronic structure of Cr, Mn, and Fe along the lines of Schrieffer and Hirst as ions with integral numbers of d-electrons, possessing crystal field and spin-orbit couplings.