Answer: rcrumb

AnswerCrossword Clue
RCRUMB"Keep on Truckin'" cartoonist
RCRUMB"Keep on Truckin'" artist
RCRUMBCartoonist who created Fritz the Cat
RCRUMBUnderground comix pioneer
RCRUMB"The Book of Mr. Natural" cartoonist
RCRUMBFritz the Cat's creator
RCRUMBBig name in comix
RCRUMBFritz the Cat illustrator
RCRUMBCreator of Fritz the Cat