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N.G.C. extra--galactic nebulae plotted on B.D. charts

APA Citation

Lundmark, K. Emil. (1942). N.G.C. extra--galactic nebulae plotted on B.D. charts. [Lund?.

Lundmark, Knut Emil, 1889-1958. N.G.C. Extra--galactic Nebulae Plotted On B.D. Charts. [Lund?, 1942.

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