Matches in Library of Congress for { ?s ?p Helium Spectra.. }
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- 2007468716 subject "Helium Spectra.".
- 27001649 subject "Helium Spectra.".
- 32009343%2F%2Fr87 subject "Helium Spectra.".
- 71009300%2F%2Fr93 subject "Helium Spectra.".
- 72005931%2F%2Fr93 subject "Helium Spectra.".
- 72279391 subject "Helium Spectra.".
- 73122351%2F%2Fr902 subject "Helium Spectra.".
- 73171555 subject "Helium Spectra.".
- 74156575 subject "Helium Spectra.".
- 74386057 subject "Helium Spectra.".
- 76564611%2F%2Fr852 subject "Helium Spectra.".
- 83126384 subject "Helium Spectra.".
- 90100162%2F%2Fr932 subject "Helium Spectra.".
- 93124403 subject "Helium Spectra.".