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References
- ↑ Jacqueline Bergeron, ed. (2013). Highlights of Astronomy: As Presented at the XXIst General Assembly of the IAU, 1991. Springer Science & Business Media. p. 521. ISBN 9401128286.
- ↑ Fisher, Raymond H., ed. (1981). The Voyage of Semen Dezhnev in 1648. London: Hakluyt Society. ISBN 0-904180-07-7.
- ↑ Erickson, Robert F. "Willem Piso". Rare Books from the MBG Library. Missouri Botanical Garden . Retrieved 2011-04-02.
- ↑ "Johann Baptista van Helmont". History of Gas Chemistry. Center for Microscale Gas Chemistry, Creighton University. 2005-09-25. Retrieved 2007-02-23.