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Σ = a = b = a + b

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Σ = a = b = a + b --- 2000

Originally released 1969 in an edition of 250. This reproduction released in 2000 in an edition of 400. This is a Povertech Special Projects release. This set contains two copies of the same record packaged together so that sides A & B may be played simultaneously and be combined with each other at different speeds: 78 RPM, 45 RPM, 33 RPM or 16 RPM.