Copyright Policy:

All material on this site is protected by Copyright.  Any use requires prior permission.  The Webmaster will be able to forward email to the copyright holder.  (The writers and photographers have usually been glad to see their work used elsewhere, and for free for non-commercial educational purposes, but they require being asked first.) 

Linking to our site or to individual web-pages is encouraged and requires no permission.  Linking to images does require permission.  When linking to us please feel free to include our logo.