Please let us know if you discover a broken link, so we can check on it. However, please be advised that we are unable to offer technical assistance for opening the documents on our site. Most of our documents are in the PDF format and the Adobe Acrobat Reader plug-in is required. Some of the very large files, such as our program manuals are compressed. After downloading a compressed file, you must extract it. Windows XP and Vista have this built in, just right-click and choose 'extract' from the popup menu.  Mac users, open "Finder" and navigate to the file you wish to extract and double-click to extract it to the same folder.