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The Observatory books (in English ) with free versions
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Harvard College Observatory

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Circular
Harvard College Observatory
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Special Report

Smithsonian Astrophysical Observatory

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Special Report
Smithsonian Astrophysical Observatory
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Special Report

Smithsonian Astrophysical Observatory

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Special Report
Smithsonian Astrophysical Observatory
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Stellar Atmospheres

Cecilia Helena Payne Gaposchkin

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Stellar Atmospheres
Cecilia Helena Payne Gaposchkin
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Sky with Ocean Joined

Steven J. Dick and LeRoy E. Doggett

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Sky with Ocean Joined
Steven J. Dick and LeRoy E. Doggett
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