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U.S. owes helium monopoly to science : exhibit in the Hall of Science
A diagram illustrates the proportionate amounts of the various gases present in the air.
4.7 x 15.2 cm
black and white
- still image
- These materials are either in the public domain, according to U.S. copyright law, or permission has been obtained from rights owners. The digital version and supplementary materials are available for all educational uses worldwide.
- The Janet A. Ginsburg Chicago Tribune Image Collection
- Chicago Sunday Tribune (October 21, 1934), p. 2