Film positive 9 7/8 x 7 3/4) Nebula N.G.C. 7217
- Made:
- 1923 in Mount Wilson
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Film positive 9 7/8 x 7 3/4) Nebula N.G.C. 7217, exposure 5 1/2 hours, 60-inch Telescope, enlarged 11.4 diam
