File:AshFlowColumn.png

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Description
English: Time sequence of the 1912 Novarupta eruption showing three episodes of Plinian pumice falls over the span of 60 hours, and 9 packages of ignimbrite over the span of 16 hours
Date
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The Novarupta-Katmai eruption of 1912—largest eruption of the twentieth

century; centennial perspectives: U.S. Geological Survey Professional Paper 1791
Author Hildreth, W., and Fierstein, J.

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Public domain
This work is in the public domain in the United States because it is a work prepared by an officer or employee of the United States Government as part of that person’s official duties under the terms of Title 17, Chapter 1, Section 105 of the US Code. Note: This only applies to original works of the Federal Government and not to the work of any individual U.S. state, territory, commonwealth, county, municipality, or any other subdivision. This template also does not apply to postage stamp designs published by the United States Postal Service since 1978. (See § 313.6(C)(1) of Compendium of U.S. Copyright Office Practices). It also does not apply to certain US coins; see The US Mint Terms of Use.
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