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During April and May 1993, 
hours of observations were
scheduled. To achieve a flux density limit of 1 mJy (
), each field
was observed for 
minutes. The data were taken in spectral-line
mode using two 25 MHz bandpasses, each divided into seven 3 MHz channels in
two polarizations. The field centers are distributed in the sky in a
variable hexagonal grid with an average spacing of 26 arcmin between
nearest neighbors. A total of 
fields were observed in a
narrow declination strip 2.75° wide passing through the
NGP and spanning 
in RA.