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Published online by Cambridge University Press: 25 April 2016
Four catalogues based on the survey made with the Molonglo Cross-type radio telescope have so far been completed, the largest of which is MCI (Davies, Little and Mills,1973). These catalogues were noise limited and had a 5α lower limit of about 0.3 Jy. This paper gives an outline of deep surveys that have been made in order to reach significantly fainter sources, but only in a small solid angle of sky.