photo used for cover of book -- thanks!
Thanks very much for making your image, http://en.wikipedia.org/wiki/File:Shukhov_Tower_030709e_photo_by_Arssenev.jpg , available under a free license! I'm using it as the cover for the new edition of my CC-BY-SA-licensed physics textbook. The book is here http://www.lightandmatter.com/lm.pdf , linked to from here http://www.lightandmatter.com/books.html . (Scroll down for source code.) You are properly credited, and the license of your photo is stated, in the photo credits on pp. 529 and 945. If you need to contact me, my contact info is here: http://www.lightandmatter.com/area4author.html