Early Twentieth Century

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Early Twentieth Century

"Star Spectral Classification Chart" Annie Jump Cannon and Harvard University (1918–)...[57]
"What Is the Theory of Relativity?" Einstein, Albert (1919)...60
"On the Discovery of Radium" Curie, Marie (1921)...63
"My Acquaintance with Zoological Park Animals" Keller, Helen (1923)...66
"June Skies" Keller, Helen (1932)...69

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Early Twentieth Century

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