Horace Parnell Tuttle, Co-Discoverer of Swift-Tuttle Comet: 1862.

Horace Parnell Tuttle, Astronomer: 1862.

Horace Parnell Tuttle, Co-Discoverer of Swift-Tuttle Comet: 1862.

Horace Parnell Tuttle, Co-Discoverer of Swift-Tuttle Comet: 1862.

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