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2
-
Photoelectric cells in industry / by R.C. Walker.
- 621.381542
- Walker, R. C. 1896-
- I. Pitman,
- 1948.
- London :
-
Methods of psychology / T.G. Andrews, editor.
- 150.72 M5926
- John Willey & Sons ; Chapman & Hall,
- 1948.
- New York : London :