| Yellow Dog Records features Unsurpassed Masters, a series of 7 volumes featuring alternate takes and unreleased material recorded between 1962 and 1969. All these bootlegs have a very good sound quality and rely on sources clearly coming from the actual EMI master tapes. |  |
| First issues of this series were improperly mastered with only one of the stereo channels in noisy mono, and timing cues were off. A second version of the series was released that fixed the problems: it has the text "Previously available in mono only - NOW IN STEREO" on the back cover. |
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