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Project Gutenberg
PGUSA
ger
TxAuBib
Meinauer Naturlehre
[Gutenberg] /
; edited by Wilhelm, 1806-1869 Wackernagel.
Project Gutenberg,
2009.
Project Gutenberg.
Freely available.
Electronic text.
Astronomy -- Early works to 1800.
Science -- Early works to 1800.
Wackernagel, Wilhelm,
Editor.
http://www.gutenberg.org/license
Rights
TXKNC