The .wwf suffix is a pdf that cannot be printed
This is a fantastic concept from the wwf, save trees by saving a document in a format that wont allow it to print.
http://content-kids.com/post/2135932047/save-as-wwf-save-a-tree
This is a fantastic concept from the wwf, save trees by saving a document in a format that wont allow it to print.
http://content-kids.com/post/2135932047/save-as-wwf-save-a-tree