Grand Funk Railroad – Grand Funk (1969, Reel-To-Reel) - Discogs

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Grand Funk – Live Album (1970, Reel-To-Reel) - Discogs

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Grand Funk – Live Album (1970, Reel-To-Reel) - Discogs

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Grand Funk Railroad – On Time (1969, Vinyl) - Discogs

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Grand Funk Railroad – Grand Funk (1969, Reel-To-Reel) - Discogs

Why was Grand Funk Railroad fodder for critics? - Quora

Grand Funk Railroad – Grand Funk (1969, Winchester, Vinyl) - Discogs