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JohannesKepler.Info Kepler information and community website, launched on 27 December 2009

Harmonices mundi ("The Harmony of the Worlds") in fulltext facsimile; Carnegie-Mellon University

De Stella Nova in Pede Serpentarii  ("On the new star in Ophiuchus's foot") in full text facsimile at Linda Hall Library

(1920 book, part of Men of Science series)

Electronic facsimile-editions of the rare book collection at the Vienna Institute of Astronomy

Christianson, Gale E., Kepler's Somnium: Science Fiction and the Renaissance Scientist

Kollerstrom, Nicholas, Kepler's Belief in Astrology