The University of Mississippi Press has published R. Crumb: Conversations, a 240-page collection of interviews with Underground Comix grandmaster, Robert Crumb.  Author D. K. Holm, who wrote Pocket Essentials: Robert Crumb, has collected interviews with the artist that span the decades from the late 1960s to the twenty-first century.  The book is illustrated with 25 of Crumb's incomparable black-and-white line drawings and is available in both hardcover ($48) and paperback ($20) editions.

R. Crumb: Conversations, which hasn't appeared in most comic book distributor catalogs yet, is a 'must-have' item for Crumb collectors and is currently available from the University of Mississippi Press.