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2
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Minerals in world industry / Walter Henry Voskuil.
- 338.2 V967
- Voskuil, Walter Henry, b. 1892.
- McGraw-Hill,
- 1955.
- New York :
-
The chemistry and action of insecticides / Harold H. Shepard.
- 632.9517 S5471
- Shepard, Harold H. b. 1898.
- McGraw-Hill,
- c1951.
- New York :