Conservation of helium gas : hearings before the Committee on Military Affairs, House of Representatives, Sixty-eighth Congress, first session, on H.R. 5722 : a bill authorizing the conservation, production, and exploitation of helium gas, a mineral resource pertaining to the national defense, and to the development of commercial aeronautics, and for other purposes : Thursday, March 20, 1924
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| Format: | Book |
| Language: | English |
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Washington [D.C.] :
G.P.O.,
1924
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