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- catalog contributor b4939070.
- catalog created "1909.".
- catalog date "1909".
- catalog date "1909.".
- catalog dateCopyrighted "1909.".
- catalog description "Thesis (PH. D)--University of Pennsylvania.".
- catalog extent "cover-title, 12 p.".
- catalog issued "1909".
- catalog issued "1909.".
- catalog language "eng".
- catalog publisher "[Philadelphia]".
- catalog subject "Ionization of gases.".
- catalog title "The conductivity of air caused by certain chemical changes [microform] ...".
- catalog type "text".