 The map refernce work is accessed by a set of PDF (Portable Document Format) files. This requires an Acrobat Reader to be installed on your computer. If you fail to access these files there is a good chance that you do not have Acrobat installed, or your version of Acrobat is well past its usefulness in the 21st century. A free and fresh version can be downloaded from http://www.adobe.com/products/acrobat/ |