The Canadian and US vinyl market in 1971

There is a theory about the Canadian vinyl market in 1971, published by me.
See this release and edit notes at Edit #69140227.
Any comments?

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Maybe, the theory is related to the US market too. I added an additional note to the mentioned edit.

The MAPL logo means that this release was intended for the canadian market.


I just created btw which is related to MAPL.

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Thanks a lot!
This link is interesting!

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