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2
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An introduction to symbolic logic / by Susanne K. Langer.
- 511.3 L276 1967
- Langer, Susanne K. 1895-1985
- Dover Publications,
- c1967.
- New York :
-
The variational theory of geodesics / M.M. Postnikov ; translated by Scripta Technic ; edited by Bernard R. Gelbaum.
- 515.64 P8585 1967
- Postnikov, M. M.
- Dover Publications,
- c1967.
- New York :