You are welcome to download whatever you like from this site for personal or educational use. If you use some of this stuff on the web or elsewhere, I ask that you provide a link to the Black Hole icon Falling into a Black Hole page. <-- If you use material from these pages other than on the web, I ask that you give due credit, and provide the URL reference to my homepage, . -->

This is a matter of standard web etiquette. Whenever you use other people's stuff, you should reference the source.

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Updated 27 Jan 2018