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Fig. 7a. Planetary Nebula, N. G. C. 2.392. Photographed at the Lick Observatory.
Fig. 7b. Planetary Nebula, N. G. C. 40. Photographed at the Lick Observatory.
Page:Popular Science Monthly Volume 87.djvu/231
Fig. 7a. Planetary Nebula, N. G. C. 2.392. Photographed at the Lick Observatory.
Fig. 7b. Planetary Nebula, N. G. C. 40. Photographed at the Lick Observatory.