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Patents and how to get one : a practical handbook / U.S. Department of Commerce.
- 346.7304/86
- Dover Publications,
- 2000.
- Mineola, N.Y. :
-
Sundials : their construction and use / R. Newton Mayall and Margaret W. Mayall.
- 681.1112 M4676
- Mayall, R. Newton
- Dover Publications,
- 2000.
- Mineola, N.Y. :