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2
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The facts on file dictionary of mathematics / edited by Carol Gibson.
- 510.3 F1425 1982
- Facts On File,
- 1982.
- New York :
-
The encyclopedia of environmental studies / William Ashworth.
- 333.7'0973
- Ashworth, William, 1942-
- Facts On File,
- c1991.
- New York :