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>A Proposal for the Comparison of the Magnitude Scales of the Astrographic Catalogue. Seventh Note. The Vatican Magnitudes. With a Photographic Determination of the Relative Galactic Condensation per Stellar Magnitude
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A Proposal for the Comparison of the Magnitude Scales of the Astrographic Catalogue. Seventh Note. The Vatican Magnitudes. With a Photographic Determination of the Relative Galactic Condensation per Stellar Magnitude