Book excerpt: Dr. Alan Gribben, a foremost Twain scholar, made waves in 1980 with the publication of Mark Twain's Library, a study that exposed for the first time the breadth of Twain's reading and influences. Prior to Gribben's work, much of Twain's reading history was assumed lost, but through dogged searching Gribben was able to source much of Twain's library. Mark Twain's Literary Resources is a much-expanded examination of Twain's library and readings. Volume I included Gribben's reflections on the work involved in cataloging Twain's reading and analysis of Twain's influences and opinions. This volume, long awaited, is an in-depth and comprehensive accounting of Twain's literary history. Each work read or owned by Twain is listed, along with information pertaining to editions, locations, and more. Gribben also includes scholarly annotations that explain the significance of many works, making this volume of Mark Twain's Literary Resources one of the most important additions to our understanding of America's greatest author.