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2
-
the Principles of electricity / Norman R. Campbell.
- 537 C1871
- Campbell, Norman Robert, 1880-
- T.C. & E.C. Jack,
- [1924?]
- London :
-
What is Science? / by Norman Campbell.
- 501
- Campbell, Norman Robert, 1880-
- Methuen,
- 1921.
- London :