Although this somewhat technical work is aimed primarily at software developers who will be writing the programs to encompass digital information, the authors never lose sight of the importance of the role that librarians play in the selection and collection of information that will form digital libraries. [The authors, both computer science faculty members at the University of Waikato, New Zealand, are involved with the New Zealand Digital Library research project; Witten is the director.] Anyone who has ever done an Internet search will benefit from understanding some of the concepts underlying the structures of search engines. The section titled "Presentation: User Interfaces" is particularly enlightening in its descriptions of how various search engines can treat the same search differently. For example, this section contains easily understandable explanations of the importance of language stemming using morphological reduction and of case folding. For librarians wanting to try their hands at creating a digital library that can stand alone or be accessible via the Internet, the authors suggest the freely available Greenstone software (www.greenstone.org), for Windows or UNIX operating systems. Librarians, particularly those who envision building their own full-text digital libraries, will find useful information here.