This volume contains recent advances in spectrographic methods, including EPR, magnetic Mossbauer, paramagnetic and multi-D NMR, metalloprotein crystallography, EAS, magnetic circular dichroism, resonance Raman, X-ray absorption spectroscopy, and electron structure calculations. The book concentrates on topics where spectrographic methods have had a major impact, such as electron transfer, cluster interactions, and definition of active site structure, and it includes a thorough tutorial on basic methods.