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Present-day resonance magnetometers form a very broad class of instruments capable of almost any magnetic-field measurement, especially since the advent of new types having a sensitivity of some 10-10G. However, the wide variety of existing devices makes any comparison between them difficult. This review will therefore put emphasis on the principles of operation and general properties of resonance magnetometers, rather than give many details on models already described in previous surveys such as the one (1967) by Grivet and Malnar . The background thus provided will be applied to a more specific study of existing types.