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2
-
Ancient technology / John W. Humphrey.
- 609.3 H9261
- Humphrey, John William, 1946-
- Greenwood Press,
- c2006.
- Westport, Conn. :
-
Medieval science and technology / Elspeth Whitney.
- 509.02 W617
- Whitney, Elspeth.
- Greenwood Press,
- 2004.
- Westport, Conn. :