Richter, Carl. 1995. CRUMB-ology: The Works of R. Crumb 1981-1994. Water Row Press.
---. 1998. Crumb-ology Supplement Summer 1994 to August 1998. Water Row Books.
Don Fiene. 1981. R. Crumb Checklist. Boatner Norton Press.
These three books are indispensable for any Crumb collector. They painstakinly document his huge output and are organized in a logical way. They also interrelate where the same piece is used in different media. The latest two were compiled by Carl Richter (covering works done between 1981-1994) and build upon the original groundbreaking work by Don Fiene (covering the period through 1981). A fairly comprehensive selection of work done since 1998 is compiled on Uncle Carl's What's New.
