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Association of labels & . Catalog numbers are 'WC XXXXX', 'MGC XXXXX', 'MGW XXXXX' (mono), 'SRW XXXXX' (stereo), 'PKW-2-XXX' (2LP's). Also add as co-label if it appears on the release. May also appear as "Mercury Wing Records" on 7"s or "Wing Mercury" on 2xLP's.
