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Henrietta Swan Leavitt - Wikipedia
Henrietta Swan Leavitt | Biography & Facts | Britannica
Henrietta Swan Leavitt - Biography, Facts and Pictures
Henrietta Swan Leavitt: Discovered How to Measure Stellar ...
Meet Henrietta Leavitt, the woman who gave us a universal ruler
Henrietta Swan Leavitt Biography – Facts, Childhood ...
Biography of Astronomer Henrietta Leavitt - ThoughtCo