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2
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Calculus the easy way / Douglas Downing ; illustrations by Susan Detrich.
- 515 D7512 1988
- Downing, Douglas,
- Barron's Educational Series,
- [1988] ©1988
- New York :
-
Trigonometry, the easy way / by Douglas Downing ; illustrations by Susan Detrich.
- 516.24 D7512
- Downing, Douglas,
- Barron's Educational Series,
- [1984] ©1984
- New York :