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    Everything on this site © Mark A. Chappell.    Without prior permission, any use other than viewing on this website is prohibited.   Copying, downloading, reproduction, or distribution of these images in any manner is protected by United States of America and International Copyright laws.   So... if you wish to use these images in any way other than just viewing this site, please contact me first.  One exception:   any of the images can be used gratis by graduate students for research presentations, or University faculty for coursework or research presentations -- but as a courtesy I'd appreciate it if you let me know which images you use.

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