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1. Interior of Yerkes Observatory, Williams Bay, on Lake Geneva, Wisconsin

2. The University of Chicago Yerkes Observatory

3. The University of Chicago Yerkes Observatory

4. The University of Chicago. Yerkes Observatory, Williams Bay, Wis.

5. Yerkes' Observatory, Lake Geneva, Wis.

6. The Yerkes Observatory of the University of Chicago, William Bays, Wisconsin

7. Comet Hyakutake photographed over the Yerkes Observatory 90-foot diameter dome in March 1996

8. The honeycombed structure of the 200" mirror sets waiting for the thin aluminum coating that will give it its high reflectivity

9. Largest (200-inch) mirror in the world

10. Palomar Mountain, California, 200" observatory - assistant seated at control panel with the great mirror in the background

11. Palomar Mountain, California, 200" observatory - observer is seated at the Casse-grain focus ready to insert the photographic...

12. Palomar Mountain, California, 200" observatory - the observer is adjusting the photographic plate

13. Seen from above after its old film of aluminum has been removed, Palomar Observatory's 200" Hale telescope mirror shows its...

14. With its new film of aluminum the 200" primary mirror of Palomar Observatory's 200" Hale telescope waits to be placed back into...

15. Ann Arbor, Mich. University of Michigan, the observatory

16. Climax Station of the High Altitude Observatory, University of Colorado

17. Columbus, Ohio, observatory- Ohio State University

18. A fireworks display is staged near the 107-inch dome at the University of Texas McDonald Observatory

19. Kirkwood Observatory, Indiana University, Bloomington, Indiana

20. McDonald Observatory Ft. Davis Tex.