Preface. Y. Yamamoto, NMR Study of Active Sites in Paramagnetic Haemoproteins. H. Saito, S. Tuzi, and A. Naito, Empirical Versus Non-Empirical Evaluation of Secondary Structure of Fibrous and Membrane Proteins by Solid-State NMR: A Practical Approach. C.I. Ratcliffe, Xenon NMR. Subject Index.