http://www.physics.ucla.edu/~cwp/Phase2/Leavitt,_Henrietta_Swan@871234567.html
http://www.mada.org.il/website/html/eng/2_1_1-31.htm
http://astro.berkeley.edu/~gmarcy/women/leavitt.html
http://apod.nasa.gov/apod/ap981027.html
http://www.sjsu.edu/depts/Museum/lea.html
http://hoa.aavso.org/posterswan.htm
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