Contents: The work of the bureau international des poids et mesures concerning electromagnetic units and measurements, Some aspects of fringe counting in laseer interferometers, Interferometric measurements on diffuse surfaces by holographic techniques, Calorimetric measurement of pulsed laser output energy, An intercomparison of hydrogen and cesium frequency standards, Clock synchronization via relay II satellite, A meteor burst clock synchronization experiment, A dual frequency VLF timing system, An improved 5 MHz reference ...