Interferometer phase calibration sources -: III.: The regions +20°≤δB1950≤+35° and +75°≤δB1950≤+90°

We present a catalogue of 540 compact radio sources in the declination ranges +20 degrees less than or equal to delta(B1950) less than or equal to +35 degrees and +75 degrees less than or equal to delta(B1950) less than or equal to +90 degrees, the positions of which have been measured to an rms accuracy of about 55 rnas with the Very Large Array (VLA). These sources are primarily intended for use as phase calibration sources for MERLIN. However, they will also be suitable as phase calibrators for the VLA and can be considered as candidate phase calibrators for very long baseline interferometry (VLBI) networks.