File:Plate LI Fossil Shells Gryphaea Vesicularis.jpg

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English: Original Caption: Fossil shells, Gryphaea vesicularis, from the base of the Saratoga Chalk-Marl. 1, Outside view of large valve; 1a, inside view of large valve. Natural size.
Date
Source Chalk of Southwestern Arkansas, with notes on its adaptability to the manufacture of hydraulic cements by Joesph A. Taff. Extract from the 22nd Annual Report of the United States Geological Survey, 1900-1901, Part III - Coal, Oil, Cement. Washington Government Printing Office, 1902.
Author Joseph A. Taff (USGS)

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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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