observatory 35

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U. of M., Ann Arbor, the Ob...

1880

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The Observatory, Georgetown...

1904

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The Observatory, U. of M., ...

1890

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High Rock Observatory, near...

1900

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High Rock Observatory, near...

1900

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Observatory, Munjoy Hill, P...

1904

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Observatory, Patterson Park...

1903

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Allegheny Observatory, Rive...

1900

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Observatory, Harvard College

1900

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The Observatory, Georgetown...

1900

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Allegheny Observatory, Rive...

1900

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The Observatory, University...

1900

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Observatory of University o...

1900

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Observatory, Mt. Mount Holy...

1900

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Washburn Observatory and Ob...

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Observatory Hill, Wellesley...

1908

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Allegheny Observatory, Rive...

1900

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New concrete observatory to...

1910

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Observatory, Amherst College

1908

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Cincinnati Observatory Buil...