This area includes over 250 original maps from the period. Each map page contains one image for preview (JPG format) and one image towards the bottom of the page for download (JPEG 2000 format). The JPEG 2000 is a format which allows for incredible zooming and the ability to view many small details of a map. To accomodate this detail, the file sizes are larger and noted next to each download link. When looking, one might use the page images to preview what the maps look like, then download the JPEG 2000 file of any maps they would like to look at in detail.