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Excursions in science. Program no. 591, New search for old minerals Excursions in science. Program no. 594, Automatic controls
Program no. 591: A discussion about the new methods being used to find minerals and the search for new minerals due to high demands. Based on a research by Dr. John G. Broughton. Program no. 594: A discussion about automatic controls in industry and examples of how automatic controls work. Based on a research by E.H. Alexander.
- "New search for old minerals"@en
- "Program no. 591: A discussion about the new methods being used to find minerals and the search for new minerals due to high demands. Based on a research by Dr. John G. Broughton. Program no. 594: A discussion about automatic controls in industry and examples of how automatic controls work. Based on a research by E.H. Alexander."@en
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- "Excursions in science. Program no. 591, New search for old minerals Excursions in science. Program no. 594, Automatic controls"@en