The 6C survey of radio sources: Pt. 4

The sixth Cambridge survey of radio sources covers most of the sky north of δ+30o with an angular resolution of 4.2x4.2 cosec δ arcmin2 and reaches a limiting flux density of 160 mJy at 151 MHz in the present zone with completeness achieved at 400 mJy on the best maps and at about 800 mJy on the worst. This paper presents 172 pages of maps of a region 67o<δ<82o, 0h<α<24h together with a list of 5421 sources in the 1440 deg2 covered. The text outlines only essential details of operation and analysis specific to this zone, since the principles of the method used to gather data and produce maps from a non-tracking telescope operating at declinations other than the north celestial pole have already been fully described. (author)