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3
-
Photoelectric cells in industry / by R.C. Walker.
- 621.381542
- Walker, R. C. 1896-
- I. Pitman,
- 1948.
- London :
-
Vacuum tubes / Karl R. Spangenberg.
- 621.384132
- Spangenberg, Karl Rudolph, 1910-
- McGraw-Hill Book Co.,
- 1948.
- New York :
-
Psychiatry : a short treatise/ by William Albert O'Connor.
- 616.89 O183
- O'Connor, William Albert.
- Williams and Wilkins,
- 1948.
- Baltimore :