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File:Electricity by Robert M Ferguson.png

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Català: Portada del llibre Electricity (1866) de Robert MacNair Ferguson (1829-1912), matemàtic escocès
Source Google books:
Author Robert MacNair Ferguson (1829-1912)


Public domain

This work is in the public domain in its country of origin and other countries and areas where the copyright term is the author's life plus 100 years or less.

This work is in the public domain in the United States because it was published (or registered with the U.S. Copyright Office) before January 1, 1923.

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