< Page:Popular Science Monthly Volume 61.djvu
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THE PROGRESS OF SCIENCE.
187
Map of Volcanic Disturbances. (From Bonney's 'Volcanoes' Putnam's Science Series.)
| |||| | Signifies Extinct Volcanoes. |
| Signifies Active Volcanoes but is not intended to indicate either the number or the exact position. | |
| - - - - - - | Signifies the probable direction of lines of weakness in the earth's crust. |
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