File:PSM V77 D161 Isoseismals of the earthquakes in the upper mississppi valley.png

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English: Isoseismals of the earthquakes in the upper mississppi valley
Date
Source Popular Science Monthly Volume 77
Author Unknown authorUnknown author

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Public domain
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, 1929.

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Note: This tag should not be used for sound recordings.PD-1923Public domain in the United States//commons.wikimedia.org/wiki/File:PSM_V77_D161_Isoseismals_of_the_earthquakes_in_the_upper_mississppi_valley.png

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12 June 1910Gregorian

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