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Published online by Cambridge University Press: 14 August 2015
The understanding of the nature of strong radio emission associated with galaxies and quasars has significantly increased in the last five years. A large contribution to this increase has been obtained from the arcsec and milli-arcsec mapping of radio sources which show remarkable features. Because of the recent, extremely good review articles concerning extended extragalactic radio sources (Miley 1980 and Willis 1978), I shall emphasize some new, mostly unpublished works, stemming from VLA observations. This is not to slight European experimental and theoretical work which have led in the formulation of our current thinking, but to try to bridge the inevitable communication gap caused by the Atlantic Ocean and ever higher airfares.