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THE FIRST SIX BOOKS,
Together with the
- - * ELEVENTH AND TWELFTH.
| - r - 1
THE ERRons,

-
By which Theon, or others, have long ago vitiated these Books, are corrested, and some ef
- Euclid's demonstrations are restored.

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ELEMENTS OF PLANE AND SPHERICAL TRIGONOMETRY.

f

o --

- PHILADELPHIA:

PUBLISHED BY JOHNSON AND WARNER, -
AND SOLD AT THEIR BOOKSTORES IN PHILADELPHIA, RICHMOND, (Vir.)
- AND LEXINGTON, (Ken.)

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