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| Alphabetical [« »] invariability 1 investigated 1 investigation 1 investigations 2 invisible 2 iron 9 is 286 | Frequency [« »] 2 intensity 2 introduced 2 introductory 2 investigations 2 invisible 2 kinds 2 knowledge | Hermann Ludwig Ferdinand von Helmholtz On the Conservation of Force IntraText - Concordances investigations |
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1 II | experimental and mathematical investigations, especially of the great 2 III| obtained by such varied investigations of different observers.~