Heritage's May 9 auction features legendary offerings from D.C.'s famed The Guitar Shop

In 1974 Hartman left Cal State Northridge with a graphic arts degree and designed two dozen covers for the likes of Poco and America – as well as the interlocking "CSN" logo for Crosby, Stills & Nash. In a new letter accompanying the Martin, Graham writes that he "used it for songwriting, recording and on stage" and gave it to Hartman during his SNL run "to show my appreciation" for having designed the CS&N logo.

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