Conversation so far:
What is an example of Robert Crumb's early work?
His first job, in 1962, was drawing novelty greeting cards for American Greetings in Cleveland, Ohio.
How long did Robert Crumb work at American Greetings?
He stayed with the company for four years.
Did Robert Crumb like his job at American Greetings?
Dissatisfied with greeting card work, he tried to sell cartoons to comic book companies, who showed little interest in his work.
What job did Robert Crumb do after he left American Greetings?
Crumb briefly illustrated bubblegum cards for Topps before returning to Cleveland and American Greetings.
Was Robert Crumb successful at first?
Did Robert Crumb ever get anything published early on?
In 1965 and 1966 Crumb had a number of Fritz the Cat strips published in the men's magazine Cavalier.
Are there any other interesting aspects about Robert Crumb's early career?
Crumb created a number of his best-known characters during his years of LSD use, including Mr. Natural, Angelfood McSpade, and the Snoid.
Was Fritz a character Robert Crumb developed?
Fritz the Cat is a comic strip created by Robert Crumb.
What were some other characters in Robert Crumb's published work besides Fritz?
Mr. Natural is another character created by Robert Crumb.

Question: What year was that?
Self-contained rewrite: What year did Robert Crumb create Mr. Natural?