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2
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Numerical control of machine tools / [by] S.J. Martin.
- 621.902 M3791 1973
- Martin, S. J.
- The English Language Book Society and English Universities Press,
- 1973.
- London :
-
Main trends in psychology / Jean piaget.
- 150.72 P579
- Piaget, Jean, 1896-1980.
- George Allen & Unwin Ltd.,
- 1973.
- London :