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- 20017910 contributor B601414.
- 20017910 created "1920.".
- 20017910 date "1920".
- 20017910 date "1920.".
- 20017910 dateCopyrighted "1920.".
- 20017910 description "Thesis (Ph. D.)-- University of Pennsylvania, 1920.".
- 20017910 extent "1 p. l., p. [285]-288.".
- 20017910 issued "1920".
- 20017910 issued "1920.".
- 20017910 language "eng".
- 20017910 publisher "Lancaster, Pa., Press of the New era printing company,".
- 20017910 subject "QC454 .K22".
- 20017910 subject "Spectrum analysis.".
- 20017910 subject "X-rays.".
- 20017910 title "Wave-length measurements in the M series of some high-frequency spectra, by J.C. Karcher ...".
- 20017910 type "text".