This CD-ROM contains enhanced versions of all papers in the accompanied special issue. Text is formatted to take advantage of the electronic medium and, in a few cases, supplemental notes not contained in the print version are included. The most important difference between the print and electronic version of the issue, however, relates to illustrations. The electronic version of most papers contain colour illustrations that are not included in the print version (or are included in monochrome). In addition, most papers in the electronic version include dynamic illustrations, thus allowing readers to view animations discussed in the paper and/or manipulate interactive maps.
