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| NON posseduto | |
| Autore principale: | Ritchie, William, 1790-1837.
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| Titolo: | On a new photometer, founded on the principles of Bouguer / by William Ritchie. |
| Note: | Includes bibliographical references |
| In: |  Edinburgh journal of science Vol. 5 (1826), p. 139-141 |
| 000000171787 |
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