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Excursions in science. Program no. 349, The heat pump Excursions in science. Program no. 350, Bird navigation
Program no. 349: A discussion about the use of a heat pump for both heating and cooling, which allows for centralization of equipment for heating and cooling. Based on a research paper by W.E. Johnson. Program no. 350: A discussion about the modern usage and training of homing pigeons by the Army Signal Corps. Based on a research paper by Henry L. Yeagley.
- "Program no. 349: A discussion about the use of a heat pump for both heating and cooling, which allows for centralization of equipment for heating and cooling. Based on a research paper by W.E. Johnson. Program no. 350: A discussion about the modern usage and training of homing pigeons by the Army Signal Corps. Based on a research paper by Henry L. Yeagley."@en
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- "Excursions in science. Program no. 349, The heat pump Excursions in science. Program no. 350, Bird navigation"@en