Exploring Digital Libraries fills a gaping hole in library science literature and textbooks. Supported by her own extensive professional experience, Calhoun traces the history and impact of digital libraries from the 1990s through today. Not only does she give a comprehensive history of digital libraries, but she also queries how the digital library might evolve in the future, as our knowledge and experience with the web and web-based projects deepen. From the “cloud” to “community,” and from the “mass digitization” to the “digital divide,” Calhoun has meticulously covered everything the reader needs to know in this clear, easy to follow textbook. Exploring Digital Libraries also transcends the traditional textbook, and will be incredibly useful to practicing librarians. Calhoun has meticulously gathered data on digital libraries and their respective projects, giving valuable insight into what worked, what did not work, and why. This is a book by a librarian for other librarians, and that really is what makes this book stand out. This is a must-have reference for the library, and it will be especially helpful to those librarians looking to understand where the digital library has been, where it stands now, where it may be going, and how we, as librarians, can most effectively employ digital libraries for our communities. Reviewer: Allison Hunter Hill; Ages adult professional.