The map library files are intended as an alternative to the interactive map viewer; they contain the same broadband availability data. However, note that the PDF files are quite large and may take time to download. The reason the map file size is large is because these files are layered PDFs. Layered PDFS are best used with Adobe Reader 8.0 or higher, which you may download for free.
The map contains several layers, each with different pieces of information, you can “turn on and off” layers that you want to see. To view the layers functionality, from the Main Toolbar > Click View > Navigation Panels > Layers to select different map views.