This page has been validated.
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.
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.