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The history and use of our earth's chemical elements : a reference guide / Robert E. Krebs ; illustrations by Rae Déjur.
- 546 K9211 2006
- Krebs, Robert E., 1922-
- Greenwood Press,
- 2006.
- Westport, Conn. :
-
Earth cycles : a historical perspective / David Oldroyd.
- 551 O449
- Oldroyd, D. R.
- Greenwood Press,
- c2006.
- Westport, Conn. :
-
Medieval science and technology / Elspeth Whitney.
- 509.02 W617
- Whitney, Elspeth.
- Greenwood Press,
- 2004.
- Westport, Conn. :