Containing 27,000 entries and over 6,000 new entries, the online edition of the Encyclopedia of Popular Music includes 50% more material than the Third Edition. Featuring a broad musical scope covering popular music of all genres and periods from 1900 to the present day, including jazz, country, folk, rap, reggae, techno, musicals, and world music, the Encyclopedia also offers thousands of additional entries covering popular music genres, trends, styles, record labels, venues, and music festivals. Key dates, biographies, and further reading are provided for artists covered, along with complete discographies that include record labels, release dates, and a 5-star album rating system.

The Encyclopedia of Caves and Karst Science contains 350 alphabetically arranged entries. The topics include cave and karst geoscience, cave archaeology and human use of caves, art in caves, hydrology and groundwater, cave and karst history, and conservation and management. The Encyclopedia is extensively illustrated with photographs, maps, diagrams, and tables, and has thematic content lists and a comprehensive index to facilitate searching and browsing.

"The best book yet about The Doors." --Booklist Now available as an ebook for the first time...the inside story of the Doors, by cofounder and keyboard player Ray Manzarek. Includes 16 pages of photos. "A refreshingly candid read...a Doors bio worth opening." --Entertainment Weekly No other band has ever sounded quite like the Doors, and no other frontman has ever transfixed an audience quite the way Jim Morrison did. Ray Manzarek, the band's co-founder and keyboard player, was there from the very start--and until the sad dissolution--of the Doors. In this heartfelt and colorfully detailed memoir, complete with 16 pages of photographs, he brings us an insider's view of the brief, brilliant history...from the beginning to the end. "An engaging read." --Washington Post Book World