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2
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Modern atomic theory : an elementary introduction / by J.C. Speakman.
- 539.14 S7411
- Speakman, J. Clare b. 1907.
- E. Arnold & co.,
- 1951.
- London :
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An introduction to the modern theory of valency / by J.C. Speakman.
- 541.224 S7411
- Speakman, J. Clare b. 1907.
- E. Arnold & co.,
- 1949.
- London :