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"Head of Halley's Comet, May 8, 1910; Reduced from Photograph taken at the Mt. Wilson Solar Observatory," from "A Beginner's Star-Book" by Edgar Murphy (1912). Color and cropping edits.

https://archive.org/details/beginnersstarboo00murp

#comet

A beginner's star-book; an easy guide to the stars and to the astronomical uses of the opera-glass, the field-glass and the telescope : Murphy, Edgar Gardner, 1869-1913 : Free Download, Borrow, and Streaming : Internet Archive

A list of books: p. 144-146
Internet Archive
#Comet

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