Dictionary of Nomenclature of Celestial Objects

  greater than    10 arcseconds in diameter on Palomar Sky Survey (Epoch I) plates    within 30 degrees of the North Galactic Pole. 
More information available here: http://astronomy.mnstate.edu/cabanela/research/MAPSNGP/
In the format, 'O' and 'E' stand for the plate image, 'FFFF' for plate number.
See MAPS. in source:NAME NGP Ref:=2001ApJ...550L..35B byBARTON E.J. , VAN ZEE L. Astrophys. J., 550, 35-38 (2001) Possible local spiral galaxy counterparts to compact blue galaxies at intermediate redshift. o1st ref. with <MAPS-NGP O-FFFF-NNNNNNNA> N=1. =E=Catalogue in electronic form as VII/214
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