File:Elementary astronomy; a beginner's text-book (IA elementaryastron00hold).pdf
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![File:Elementary astronomy; a beginner's text-book (IA elementaryastron00hold).pdf](https://upload.wikimedia.org/wikipedia/commons/thumb/6/6f/Elementary_astronomy%3B_a_beginner%27s_text-book_%28IA_elementaryastron00hold%29.pdf/page1-380px-Elementary_astronomy%3B_a_beginner%27s_text-book_%28IA_elementaryastron00hold%29.pdf.jpg?20200714000818)
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