Photometric survey near the main Galactic meridian: 2.1. Finding charts and photoelectric U, B, V, R stellar magnitudes in 25 fields

Finding charts and photoelectric U, B, V, R magnitudes of stars in 25 fields in the Main Galactic Meridian (programme MEGA) are presented. This part of the photometric survey includes fields near the North Galactic pole and fields at southern Galactic latitudes. Together with the finding charts of 2.5° × 2.5° the equatorial coordinates of the stars are given for epoch and equinox 1950.