Book excerpt: Your map through the network jungle. Here's how to track down virtually every network available to academics and researchers. This new book, with its detailed compilation of host- level information, provides everything you need to locate resources, send mail to colleagues and friends worldwide, and answer questions about how to access major national and international networks. Extensively cross- referenced information on ARPANET/MILNET, BITNET, CSNET, Esnet, NSFNET, SPAN, THEnet, USENET, and loads of others is all provided. Included are detailed lists of hosts, site contacts, administrative domains, and organizations. Plus, a tutorial chapter with handy reference tables reveals electronic mail 'secrets' that make it easier to take advantage of networking.