https://www.discogs.com/lists/Quadraphonic-40-Mixes-Available-on-Modern-Media/376249?page=1
(hasn't been updated for several years though)
Kirk Bayne
(hasn't been updated for several years though)
Kirk Bayne
This is a well written article with tons of history. I would have added in a few more titles (other than just two) from Audio Fidelity. I think AF are responsible in some cases of waking up labels to the value of these old quad masters. And AF also dug out a couple of previously unissued quad masters which was ground breaking and they were the first to do this and nearly the last.
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