Kepler
Legal full-text edition
Kepler
Validated textsAstronomyBiographies of astronomersMacmillan and CompanySociety for Promoting Christian Knowledge
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Public-domain status shown for US. Wikisource marks this text PD-old; publication year 1920 is within the US public-domain cutoff
Public-domain status shown for US. Wikisource marks this text PD-old; publication year 1920 is within the US public-domain cutoff