Sign for "Wall Drug" of South Dakota, USA, at South Pole, Antarctica

From http://astro.uchicago.edu/home/web/gd1/misc.html (used with permission from author)

Here's the email I sent, and the response from the author. I interpreted it as use under GFDL. Treat it how you will.

> > Hi there,
> > 
> > While researching an article on Wall Drug 
> > (http://en-two.iwiki.icu/wiki/Wall_Drug) for Wikipedia, I came
> > across 
> > your funny picture of the South Pole sign touting Wall Drug, and I
> > would 
> > like to use it in the article.  Because of the nature of Wikipedia,
> > 
> > though, we would like you to grant permission for anyone to use,
> > copy 
> > and share the image, though you would still retain the copyright
> > and 
> > authorship.  These terms are specified in the GFDL.  You can view
> > the 
> > license in full at: 
> > http://www.wikipedia.org/wiki/Wikipedia:Text_of_the_GFDL
> > 
> > May we use your Wall Drug image at 
> > /http://astro.uchicago.edu/home/web/gd1/misc.html/  under these 
> > permissive terms?
> > 
> > Wikipedia (http://www.wikipedia.org) is a free encyclopedia that is
> > 
> > collaboratively edited by volunteers from around the world. Our
> > goal is 
> > to create a comprehensive knowledge base that is not only available
> > at 
> > no charge, but is also freely distributed.
> > 
> > If you agree, we will credit you for your work in the image's
> > permanent 
> > Description Page, noting that it is your work and is used with your
> > 
> > permission, and we will provide a link back to your website.
> > 
> > Thanks!
> > 

Hi John,

Yeah, no problem - you can use the photo (with credit).

Cheers,

(name redacted)