[78-L] Approximating 78s age by physical characteristics

[David London]

Great resource.  Lot's of other info there too.  Thanks, I am exploring 
it now.

On 04/03/13 10:46, Kristjan Saag wrote:
> Here's a little bit about the first double-sided discs and also about
> the Twin label.
> http://www.musicweb-international.com/Friedman/page25.htm
> Kristjan
>
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